/orbit_info/crossing_time[
crossing_time=
0
..0]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
description:
The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Ascending Node Crossing Time
-
source:
POD/PPD
-
standard_name:
time
-
units:
seconds since 2018-01-01
/orbit_info/cycle_number[
crossing_time=
0
..0]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
crossing_time
-
description:
A count of the number of exact repeats of this reference orbit.
-
long_name:
Cycle Number
-
source:
Operations
-
units:
1
-
valid_max:
50
-
valid_min:
0
/orbit_info/orbit_number[
crossing_time=
0
..0]
(Type is UInt16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
crossing_time
-
description:
Unique identifying number for each planned ICESat-2 orbit.
-
long_name:
Orbit Number
-
source:
Operations
-
units:
1
-
valid_max:
65000
-
valid_min:
1
/orbit_info/rgt[
crossing_time=
0
..0]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
crossing_time
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
POD/PPD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/orbit_info/sc_orient[
sc_orient_time=
0
..0]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
sc_orient_time
-
description:
This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode.
-
flag_meanings:
backward forward transition
-
flag_values:
0, 1, 2
-
long_name:
Spacecraft Orientation
-
source:
POD/PPD
-
units:
1
-
valid_max:
2
-
valid_min:
0
/orbit_info/sc_orient_time[
sc_orient_time=
0
..0]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
description:
The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Time of Last Spacecraft Orientation Change
-
source:
POD/PPD
-
standard_name:
time
-
units:
seconds since 2018-01-01
/orbit_info/lan[
crossing_time=
0
..0]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
crossing_time
-
description:
Longitude at the ascending node crossing.
-
long_name:
Ascending Node Longitude
-
source:
POD/PPD
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt1r/sea_ice_segments/height_segment_id[
delta_time=
0
..280132]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt1r/sea_ice_segments/seg_dist_x[
delta_time=
0
..280132]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/longitude[
delta_time=
0
..280132]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt1r/sea_ice_segments/latitude[
delta_time=
0
..280132]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt1r/sea_ice_segments/geoseg_beg[
delta_time=
0
..280132]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/delta_time[
delta_time=
0
..280132]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt1r/sea_ice_segments/geoseg_end[
delta_time=
0
..280132]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt1r/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1r/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..280132]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1r/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt1r/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt1r/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1r/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt1r/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt1r/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt1r/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt1r/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt1r/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt1r/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt1r/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt1r/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt1r/sea_ice_segments/stats/msw_flag[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt1r/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt1r/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1r/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt1r/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt1r/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt1r/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt1r/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..280132]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt1r/sea_ice_segments/stats/layer_flag[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1r/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt1r/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt1r/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt1r/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1r/sea_ice_segments/stats/background_int_height[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt1r/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1r/sea_ice_segments/stats/ice_conc[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt1r/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1r/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt1r/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1r/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt1r/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1r/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1r/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1r/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt1r/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/hist_w[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1r/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1r/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..280132]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1r/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1r/sea_ice_segments/stats/asr_25[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/stats/photon_rate[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt1r/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1r/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1r/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt1r/sea_ice_segments/geolocation/rgt[
delta_time=
0
..280132]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt1r/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt1r/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt1r/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt1r/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt1r/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt1r/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt1r/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt1r/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..280132]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2r/sea_ice_segments/height_segment_id[
delta_time=
0
..225002]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt2r/sea_ice_segments/seg_dist_x[
delta_time=
0
..225002]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/longitude[
delta_time=
0
..225002]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt2r/sea_ice_segments/latitude[
delta_time=
0
..225002]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt2r/sea_ice_segments/geoseg_beg[
delta_time=
0
..225002]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/delta_time[
delta_time=
0
..225002]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt2r/sea_ice_segments/geoseg_end[
delta_time=
0
..225002]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt2r/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2r/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..225002]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2r/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt2r/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt2r/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2r/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt2r/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt2r/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt2r/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt2r/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt2r/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt2r/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt2r/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt2r/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt2r/sea_ice_segments/stats/msw_flag[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt2r/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt2r/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2r/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt2r/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt2r/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt2r/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt2r/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..225002]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt2r/sea_ice_segments/stats/layer_flag[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2r/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt2r/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt2r/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt2r/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2r/sea_ice_segments/stats/background_int_height[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt2r/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2r/sea_ice_segments/stats/ice_conc[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt2r/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2r/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt2r/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2r/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt2r/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2r/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2r/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2r/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt2r/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/hist_w[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2r/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2r/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..225002]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2r/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2r/sea_ice_segments/stats/asr_25[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/stats/photon_rate[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt2r/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2r/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2r/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt2r/sea_ice_segments/geolocation/rgt[
delta_time=
0
..225002]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt2r/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2r/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt2r/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt2r/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt2r/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt2r/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2r/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt2r/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..225002]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt1l/sea_ice_segments/height_segment_id[
delta_time=
0
..276542]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt1l/sea_ice_segments/seg_dist_x[
delta_time=
0
..276542]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/longitude[
delta_time=
0
..276542]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt1l/sea_ice_segments/latitude[
delta_time=
0
..276542]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt1l/sea_ice_segments/geoseg_beg[
delta_time=
0
..276542]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/delta_time[
delta_time=
0
..276542]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt1l/sea_ice_segments/geoseg_end[
delta_time=
0
..276542]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt1l/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1l/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..276542]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1l/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt1l/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt1l/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1l/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt1l/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt1l/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt1l/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt1l/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt1l/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt1l/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt1l/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt1l/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt1l/sea_ice_segments/stats/msw_flag[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt1l/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt1l/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1l/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt1l/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt1l/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt1l/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt1l/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..276542]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt1l/sea_ice_segments/stats/layer_flag[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt1l/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt1l/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt1l/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt1l/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1l/sea_ice_segments/stats/background_int_height[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt1l/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1l/sea_ice_segments/stats/ice_conc[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt1l/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1l/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt1l/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1l/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt1l/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1l/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1l/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1l/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt1l/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/hist_w[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt1l/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1l/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..276542]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1l/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt1l/sea_ice_segments/stats/asr_25[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/stats/photon_rate[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt1l/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt1l/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt1l/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt1l/sea_ice_segments/geolocation/rgt[
delta_time=
0
..276542]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt1l/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt1l/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt1l/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt1l/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt1l/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt1l/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt1l/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt1l/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..276542]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/quality_assessment/qa_granule_fail_reason[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
qualityInformation
-
description:
Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure.
-
flag_meanings:
no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE
-
flag_values:
0, 1, 2, 3, 4, 5
-
long_name:
Granule Failure Reason
-
source:
Operations
-
units:
1
-
valid_max:
5
-
valid_min:
0
/quality_assessment/qa_granule_pass_fail[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
qualityInformation
-
description:
Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA.
-
flag_meanings:
PASS FAIL
-
flag_values:
0, 1
-
long_name:
Granule Pass Flag
-
source:
Operations
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3l/sea_ice_segments/height_segment_id[
delta_time=
0
..274700]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt3l/sea_ice_segments/seg_dist_x[
delta_time=
0
..274700]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/longitude[
delta_time=
0
..274700]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt3l/sea_ice_segments/latitude[
delta_time=
0
..274700]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt3l/sea_ice_segments/geoseg_beg[
delta_time=
0
..274700]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/delta_time[
delta_time=
0
..274700]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt3l/sea_ice_segments/geoseg_end[
delta_time=
0
..274700]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt3l/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3l/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..274700]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3l/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt3l/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt3l/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3l/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt3l/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt3l/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt3l/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt3l/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt3l/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt3l/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt3l/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt3l/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt3l/sea_ice_segments/stats/msw_flag[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt3l/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt3l/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3l/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt3l/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt3l/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt3l/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt3l/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..274700]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt3l/sea_ice_segments/stats/layer_flag[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3l/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt3l/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt3l/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt3l/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3l/sea_ice_segments/stats/background_int_height[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt3l/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3l/sea_ice_segments/stats/ice_conc[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt3l/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3l/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt3l/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3l/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt3l/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3l/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3l/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3l/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt3l/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/hist_w[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3l/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3l/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..274700]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3l/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3l/sea_ice_segments/stats/asr_25[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/stats/photon_rate[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt3l/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3l/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3l/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt3l/sea_ice_segments/geolocation/rgt[
delta_time=
0
..274700]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt3l/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt3l/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt3l/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt3l/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt3l/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt3l/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt3l/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt3l/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..274700]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2l/sea_ice_segments/height_segment_id[
delta_time=
0
..221424]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt2l/sea_ice_segments/seg_dist_x[
delta_time=
0
..221424]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/longitude[
delta_time=
0
..221424]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt2l/sea_ice_segments/latitude[
delta_time=
0
..221424]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt2l/sea_ice_segments/geoseg_beg[
delta_time=
0
..221424]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/delta_time[
delta_time=
0
..221424]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt2l/sea_ice_segments/geoseg_end[
delta_time=
0
..221424]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt2l/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2l/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..221424]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2l/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt2l/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt2l/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2l/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt2l/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt2l/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt2l/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt2l/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt2l/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt2l/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt2l/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt2l/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt2l/sea_ice_segments/stats/msw_flag[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt2l/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt2l/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2l/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt2l/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt2l/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt2l/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt2l/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..221424]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt2l/sea_ice_segments/stats/layer_flag[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt2l/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt2l/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt2l/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt2l/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2l/sea_ice_segments/stats/background_int_height[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt2l/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2l/sea_ice_segments/stats/ice_conc[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt2l/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2l/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt2l/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2l/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt2l/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2l/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2l/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2l/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt2l/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/hist_w[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt2l/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2l/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..221424]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2l/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt2l/sea_ice_segments/stats/asr_25[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/stats/photon_rate[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt2l/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt2l/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt2l/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt2l/sea_ice_segments/geolocation/rgt[
delta_time=
0
..221424]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt2l/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2l/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt2l/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt2l/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt2l/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt2l/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt2l/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt2l/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..221424]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/ancillary_data/release[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed.
-
long_name:
Release Number
-
source:
Operations
-
units:
1
/ancillary_data/end_geoseg[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.
-
long_name:
Ending Geolocation Segment
-
source:
Derived
-
units:
1
/ancillary_data/version[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release.
-
long_name:
Version
-
source:
Operations
-
units:
1
/ancillary_data/end_region[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.
-
long_name:
Ending Region
-
source:
Derived
-
units:
1
/ancillary_data/atlas_sdp_gps_epoch[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point.
-
long_name:
ATLAS Epoch Offset
-
source:
Operations
-
units:
seconds since 1980-01-06T00:00:00.000000Z
/ancillary_data/end_rgt[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.
-
long_name:
Ending Reference Groundtrack
-
source:
Derived
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/ancillary_data/end_delta_time[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
ATLAS End Time (Actual)
-
source:
Derived
-
standard_name:
time
-
units:
seconds since 2018-01-01
/ancillary_data/end_orbit[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.
-
long_name:
Ending Orbit Number
-
source:
Derived
-
units:
1
/ancillary_data/start_cycle[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.
-
long_name:
Starting Cycle
-
source:
Derived
-
units:
1
-
valid_max:
99
-
valid_min:
0
/ancillary_data/data_end_utc[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Derived
-
description:
UTC (in CCSDS-A format) of the last data point within the granule.
-
long_name:
End UTC Time of Granule (CCSDS-A, Actual)
-
units:
1
/ancillary_data/control[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
units:
1
-
description:
PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds.
-
long_name:
Control File
-
source:
Operations
/ancillary_data/start_gpssow[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
GPS seconds-of-week of the first data point in the granule.
-
long_name:
Start GPS SOW of Granule (Actual)
-
source:
Derived
-
units:
seconds
/ancillary_data/granule_end_utc[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Requested end time (in UTC CCSDS-A) of this granule.
-
long_name:
End UTC Time of Granule (CCSDS-A, Requested)
-
source:
Derived
-
units:
1
/ancillary_data/end_cycle[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
long_name:
Ending Cycle
-
description:
The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.
-
source:
Derived
-
units:
1
-
valid_max:
99
-
valid_min:
0
/ancillary_data/granule_start_utc[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Requested start time (in UTC CCSDS-A) of this granule.
-
long_name:
Start UTC Time of Granule (CCSDS-A, Requested)
-
source:
Derived
-
units:
1
/ancillary_data/start_delta_time[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
ATLAS Start Time (Actual)
-
source:
Derived
-
standard_name:
time
-
units:
seconds since 2018-01-01
/ancillary_data/start_geoseg[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.
-
long_name:
Starting Geolocation Segment
-
source:
Derived
-
units:
1
/ancillary_data/start_orbit[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.
-
long_name:
Starting Orbit Number
-
source:
Derived
-
units:
1
/ancillary_data/data_start_utc[
0
..0]
(Type is String)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Derived
-
description:
UTC (in CCSDS-A format) of the first data point within the granule.
-
long_name:
Start UTC Time of Granule (CCSDS-A, Actual)
-
units:
1
/ancillary_data/end_gpsweek[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
GPS week number of the last data point in the granule.
-
long_name:
Ending GPSWeek of Granule (Actual)
-
source:
Derived
-
units:
weeks from 1980-01-06
/ancillary_data/start_rgt[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.
-
long_name:
Starting Reference Groundtrack
-
source:
Derived
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/ancillary_data/end_gpssow[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
GPS seconds-of-week of the last data point in the granule.
-
long_name:
Ending GPS SOW of Granule (Actual)
-
source:
Derived
-
units:
seconds
/ancillary_data/qa_at_interval[
0
..0]
(Type is Float64)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Statistics time interval for along-track QA data.
-
long_name:
QA Along-Track Interval
-
source:
control
-
units:
1
/ancillary_data/start_region[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.
-
long_name:
Starting Region
-
source:
Derived
-
units:
1
/ancillary_data/start_gpsweek[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
GPS week number of the first data point in the granule.
-
long_name:
Start GPSWeek of Granule (Actual)
-
source:
Derived
-
units:
weeks from 1980-01-06
/ancillary_data/fine_surface_finding/tep_used_gt1_strong[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for strong beam of ground track 1 (1 or 3)
-
long_name:
TEP Table PCE1_Strong
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/h_diff_limit[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Maximum height difference between the two weighted Gaussian mean from the initial tracked height (units = meters)
-
long_name:
Max Ht Difference
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/n_specular[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Specular returns limits
-
long_name:
number photons Specular returns
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/tep_used_gt3_strong[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for strong beam of ground track 3 (1 or 3)
-
long_name:
TEP Table PCE3_Strong
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/n_spec_scale[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Scalling parameter used for scaling value of N_SPECULAR for the weak beam. Specular returns for weak beam are defined as a shot having more photons than (N_SPECULAR/N_SPEC_SCALE)
-
long_name:
Specular Scaling Value
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/ub_length_strong[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
upper bound of segment length strong beam
-
long_name:
upper bound segment length strong
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/ub_oc_switch_weak[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Upper bound of photon rate overlapping control for weak beam when overlap is turned off
-
long_name:
Upper bound of overlapping control for weak beam
-
source:
ATBD section 4.2.2.4
-
units:
photons/shot
/ancillary_data/fine_surface_finding/bin_f[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
bin size of fine histogram along track segment length
-
long_name:
bin size of fine histogram
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/lb_oc_switch_strong[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
units:
photons/shot
-
description:
Lower bound of photon rate overlapping control for strong beam when overlap is turned off
-
long_name:
Lower bound of overlapping control for strong beam
-
source:
ATBD section 4.2.2.4
/ancillary_data/fine_surface_finding/lb_oc_switch_weak[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
units:
photons/shot
-
description:
Lower bound of photon rate overlapping control for weak beam when overlap is turned off
-
long_name:
Lower bound of overlapping control for weak beam
-
source:
ATBD section 4.2.2.4
/ancillary_data/fine_surface_finding/tep_used_gt2_strong[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for strong beam of ground track 2 (1 or 3)
-
long_name:
TEP Table PCE2_Strong
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/n_photon_min[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Minimum fraction of photons needed for tracking
-
long_name:
Minimum number of photons
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/n_w[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
number of standard deviations
-
long_name:
number of standard deviations
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/tep_used_gt3_weak[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for weak beam of ground track 3 (1 or 3)
-
long_name:
TEP Table PCE3_Weak
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/delta_h_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
the waveform table spacing for the height (h) dimension
-
long_name:
h table spacing
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/overlap_switch[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Use of overlapping height segments (1 = yes, 0 = no)
-
flag_meanings:
no yes
-
flag_values:
0, 1
-
long_name:
Overlap Segments
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/ancillary_data/fine_surface_finding/lb_win_s[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Sea Ice ATBD
-
description:
window (Ws) containing signal photons
-
long_name:
lower bound window signal
-
units:
meters
/ancillary_data/fine_surface_finding/tep_used_gt2_weak[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for weak beam of ground track 2 (1 or 3)
-
long_name:
TEP Table PCE2_Weak
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/tep_used_gt1_weak[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
TEP used in table generation for weak beam of ground track 1 (1 or 3)
-
long_name:
TEP Table PCE1_Weak
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/n_s[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
photons in W_s
-
long_name:
number photons in W_s
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/ub_win_s[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
window (Ws) containing signal photons
-
long_name:
upper bound window signal
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/ub_length_weak[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
upper bound of segment length weak beam
-
long_name:
upper bound segment length weak
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/fine_surface_finding/ub_h_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
the waveform upper bound for the height (h) dimension
-
long_name:
upper bound of h table
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/ub_oc_switch_strong[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Upper bound of photon rate overlapping control for strong beam when overlap is turned off
-
long_name:
Upper bound of overlapping control for strong beam
-
source:
ATBD section 4.2.2.4
-
units:
photons/shot
/ancillary_data/fine_surface_finding/ub_w_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
the waveform upper bound for the width (w) dimension
-
long_name:
upper bound of w table
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/n_photon_trim[
0
..0]
(Type is Int32)
/ancillary_data/fine_surface_finding/delta_w_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
the waveform table spacing for the width (w) dimension
-
long_name:
w table spacing
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/lb_w_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
lower bound of w table
-
long_name:
lower bound of w table
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/fine_surface_finding/lb_h_tab[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
lower bound of h table
-
long_name:
lower bound of h table
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/sea_ice/min_segs_count[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
ATL07 granules with less than this number of strong beam sea ice segments will be marked as failed.
-
long_name:
Minimum Segments Count
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/sea_ice/proc_beam_pair1[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Indicates if beam pair 1 was processed.
-
flag_meanings:
not_processed processed
-
flag_values:
0, 1
-
long_name:
Processing Flag for Beam Pair 1
-
source:
Operations
-
units:
1
-
valid_max:
1
-
valid_min:
0
/ancillary_data/sea_ice/proc_beam_pair3[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Indicates if beam pair 3 was processed.
-
flag_meanings:
not_processed processed
-
flag_values:
0, 1
-
long_name:
Processing Flag for Beam Pair 3
-
source:
Operations
-
units:
1
-
valid_max:
1
-
valid_min:
0
/ancillary_data/sea_ice/geoseg_min[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Indicates the minimum segment_id to process (if specified in control)
-
long_name:
Minimum Segment ID
-
source:
Operations
-
units:
1
/ancillary_data/sea_ice/proc_interval[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
The number of 20 meter segments of data processed in one chunk
-
long_name:
Processing interval
-
source:
Operations
-
units:
1
/ancillary_data/sea_ice/proc_beam_pair2[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Indicates if beam pair 2 was processed.
-
flag_meanings:
not_processed processed
-
flag_values:
0, 1
-
long_name:
Processing Flag for Beam Pair 2
-
source:
Operations
-
units:
1
-
valid_max:
1
-
valid_min:
0
/ancillary_data/sea_ice/geoseg_max[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Indicates the maximum segment_id to process (if specified in control). The actual maximum processed may be greater than specified.
-
long_name:
Maximum Segment Id
-
source:
Operations
-
units:
1
/ancillary_data/sea_ice/region[
0
..0]
(Type is Int32)
/ancillary_data/coarse_surface_finding/bin_c[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
bin size of coarse histogram
-
long_name:
bin size coarse histogram
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/coarse_surface_finding/coarse_ub_wins[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Upper bound for signal photons when performing coarse tracking
-
long_name:
Coarse_UpperBounds
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/coarse_surface_finding/th_pc[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
percentage cloud cover coarse
-
long_name:
threshold percentage cloud cover coarse
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/coarse_surface_finding/coarse_lb_wins[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Lower bound for signal photons when performing coarse tracking
-
long_name:
Coarse_LowerrBounds
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/coarse_surface_finding/l[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
along track segment length coarse
-
long_name:
segment length coarse
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/coarse_surface_finding/th_d_bot[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Sea Ice ATBD
-
description:
Bottom distance from mode coarse
-
long_name:
Bottom threshold distance from mode coarse
-
units:
meters
/ancillary_data/coarse_surface_finding/th_fm[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Sea Ice ATBD
-
description:
fraction of histogram peak coarse
-
long_name:
threshold fraction of peak coarse
-
units:
1
/ancillary_data/coarse_surface_finding/n_ph_min[
0
..0]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Minimum number of photons required for coarse track segment
-
long_name:
Minimum Number of Photons
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/coarse_surface_finding/si_conc_min[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Sea Ice ATBD
-
description:
Minimum sea ice concentration percentage value for which to process data.
-
long_name:
Min SI Concentration Thresh
-
units:
1
/ancillary_data/coarse_surface_finding/th_d_top[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Top distance from mode coarse
-
long_name:
Top threshold distance from mode coarse
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/coarse_surface_finding/th_tc[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
height deviations from surface or adjacent strong beam
-
long_name:
Threshold height deviations
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/surface_classification/theta_ref[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Solar elevation normalization angle for use of normalized background rate
-
long_name:
Solar elevation normalization angle
-
source:
ATBD section 4.3.1.4
-
units:
degrees
/ancillary_data/surface_classification/height_pct[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Percentile of sorted heights
-
long_name:
Percentile Hts
-
source:
Sea Ice ATBD
-
units:
percentile
/ancillary_data/surface_classification/w1[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
max width (dark smooth lead)
-
long_name:
max width (dark smooth lead)
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/surface_classification/beam_gain[
0
..5]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Relative gains for beams 1 through 6 where N is the beam number (Note: Beams 1, 3, and 5 are the strong beams)
-
long_name:
relative beam gain for beams 1 through 6
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/surface_classification/p3[
0
..0]
(Type is Float32)
/ancillary_data/surface_classification/b1[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
max backgr (gray ice)
-
long_name:
max backgr (gray ice)
-
source:
Sea Ice ATBD
-
units:
1
/ancillary_data/surface_classification/p4[
0
..0]
(Type is Float32)
/ancillary_data/surface_classification/w2[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
max width (dark rough lead)
-
long_name:
max width (dark rough lead)
-
source:
Sea Ice ATBD
-
units:
meters
/ancillary_data/surface_classification/theta_cntl[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
source:
Sea Ice ATBD
-
description:
Solar elevation for controlling use of background rate
-
long_name:
Solar elevation for use of background rate
-
units:
1
/ancillary_data/surface_classification/theta_nlb[
0
..0]
(Type is Float32)
-
attributes
-
contentType:
auxiliaryInformation
-
units:
degrees
-
description:
Solar elevation normalization lower bound for use of normalized background rate
-
long_name:
Solar elevation normalization lower bound
-
source:
ATBD section 4.3.1.4
/ancillary_data/surface_classification/p1[
0
..0]
(Type is Float32)
/ancillary_data/surface_classification/p2[
0
..0]
(Type is Float32)
/gt3r/sea_ice_segments/height_segment_id[
delta_time=
0
..278029]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Identifier of each height segment
-
long_name:
Identifier of each height segment
-
source:
ATBD, section 5.2
-
units:
1
/gt3r/sea_ice_segments/seg_dist_x[
delta_time=
0
..278029]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Along-track distance from the equator crossing to the segment center.
-
long_name:
Along track distance
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/longitude[
delta_time=
0
..278029]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude
-
description:
Longitude, WGS84, East=+,Lon of segment center
-
long_name:
Longitude
-
source:
ATBD, section 4.4
-
standard_name:
longitude
-
units:
degrees_east
-
valid_max:
180.
-
valid_min:
-180.
/gt3r/sea_ice_segments/latitude[
delta_time=
0
..278029]
(Type is Float64)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time longitude
-
description:
Latitude, WGS84, North=+, Lat of segment center
-
long_name:
Latitude
-
source:
ATBD, section 4.4
-
standard_name:
latitude
-
units:
degrees_north
-
valid_max:
90.
-
valid_min:
-90.
/gt3r/sea_ice_segments/geoseg_beg[
delta_time=
0
..278029]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment
-
long_name:
Beginning GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/delta_time[
delta_time=
0
..278029]
(Type is Float64)
-
attributes
-
contentType:
physicalMeasurement
-
coordinates:
latitude longitude
-
description:
Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
-
long_name:
Elapsed GPS seconds
-
source:
telemetry
-
standard_name:
time
-
units:
seconds since 2018-01-01
/gt3r/sea_ice_segments/geoseg_end[
delta_time=
0
..278029]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
delta_time latitude longitude
-
description:
Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment
-
long_name:
Ending GEOSEG
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/heights/height_segment_fit_quality_flag[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid.
-
flag_meanings:
invalid best high med low poor
-
flag_values:
-1, 1, 2, 3, 4, 5
-
long_name:
height Quality Flag
-
source:
ATBD, section 4.2.4.2
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt3r/sea_ice_segments/heights/height_segment_length_seg[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
along-track length of segment containing n_photons_actual
-
long_name:
length of segment
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/heights/height_segment_asr_calc[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Computed apparent surface reflectance for the sea ice segment.
-
long_name:
Calculated Apparent Surface Reflectivity
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/heights/height_segment_quality[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag
-
flag_meanings:
bad_quality good_quality
-
flag_values:
0, 1
-
long_name:
Height Segment Quality Flag
-
source:
ATBD, section 4.2.4
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3r/sea_ice_segments/heights/height_segment_n_pulse_seg[
delta_time=
0
..278029]
(Type is Int32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
number of laser pulses
-
long_name:
number of laser pulses
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3r/sea_ice_segments/heights/across_track_distance[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Across track distance of photons averaged over the sea ice height segment.
-
long_name:
Across Track Distance
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt3r/sea_ice_segments/heights/height_segment_htcorr_skew[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height corection for skew
-
long_name:
Height Correction for Skew
-
source:
ATBD, section 4.2.6
-
units:
meters
/gt3r/sea_ice_segments/heights/height_segment_ssh_flag[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface
-
flag_meanings:
sea_ice sea_surface
-
flag_values:
0, 1
-
long_name:
Sea Surface Flag
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3r/sea_ice_segments/heights/height_segment_height[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean height from along-track segment fit detremined by the sea ice algorithm
-
long_name:
height of segment surface
-
source:
ATBD, section 4.2.2.4
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt3r/sea_ice_segments/heights/height_segment_type[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf
-
flag_meanings:
cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough
-
flag_values:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-
long_name:
Segment surface type
-
source:
ATBD, section 4.3
-
units:
1
-
valid_max:
9
-
valid_min:
0
/gt3r/sea_ice_segments/heights/height_segment_confidence[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis
-
long_name:
Surface height confidence
-
source:
ATBD, section 4.2.4.2
-
units:
1
/gt3r/sea_ice_segments/heights/height_segment_surface_error_est[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Error estimate of the surface height
-
long_name:
h surface error est
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/heights/height_segment_w_gaussian[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
width of best fit gaussian
-
long_name:
width of best fit gaussian
-
source:
ATBD, section 4.2.4
-
units:
meters
/gt3r/sea_ice_segments/heights/height_segment_rms[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
RMS difference between sea ice modeled and observed photon height distribution
-
long_name:
height rms
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_t2m[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Temperature at 2m above the displacement height (K)
-
long_name:
temperature_at_2m
-
source:
ATL09
-
standard_name:
temperature
-
units:
K
/gt3r/sea_ice_segments/geophysical/height_segment_dac[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.
-
long_name:
Dynamic Atmosphere Correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_ps[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Sea Level Pressure (Pa)
-
long_name:
sea level pressure
-
source:
ATL09
-
standard_name:
pressure
-
units:
Pa
/gt3r/sea_ice_segments/geophysical/height_segment_ib[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Inverted barometer effect calculated from surface pressure
-
long_name:
Inverted barometer effect
-
source:
ATBD, section 4.2
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_load[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
-
long_name:
Load Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_geoid[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model.
-
long_name:
EGM2008 Geoid
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_ocean[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)
-
long_name:
Ocean Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_v2m[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Northward wind at 2m above the displacement height (m/s-1)
-
long_name:
Northward_wind_at_2m
-
source:
ATL09
-
standard_name:
northward_wind
-
units:
m s-1
/gt3r/sea_ice_segments/geophysical/height_segment_mss[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model.
-
long_name:
DTU13 Mean Sea Surface
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_u2m[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Eastward wind at 2m above the displacement height (m/s-1)
-
long_name:
Eastward_wind_at_2m
-
source:
ATL09
-
standard_name:
eastward_wind
-
units:
m s-1
/gt3r/sea_ice_segments/geophysical/height_segment_lpe[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude)
-
long_name:
Equilibrium Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_earth[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solid Earth Tide
-
long_name:
Earth Tide
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geophysical/height_segment_pole[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
-
long_name:
Pole Tide
-
source:
Sea Ice ATBD
-
units:
meters
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
/gt3r/sea_ice_segments/stats/msw_flag[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.
-
flag_meanings:
cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5
-
flag_values:
-1, 0, 1, 2, 3, 4, 5
-
long_name:
Multiple Scattering Warning Flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
5
-
valid_min:
-1
/gt3r/sea_ice_segments/stats/hist_median_h[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Median of the n_fit_photons heights
-
long_name:
trimmed photon heights median
-
source:
ATBD, section 4.2.3.1
-
units:
meters
/gt3r/sea_ice_segments/stats/height_filter_min[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height minimum used in the ssh height filter
-
long_name:
Height Filter Min
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3r/sea_ice_segments/stats/cloud_flag_atm[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of layers found from the backscatter profile using the DDA layer finder.
-
long_name:
Cloud Flag Atm
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
10
-
valid_min:
0
/gt3r/sea_ice_segments/stats/fpb_avg_dt[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction average dead time
-
long_name:
fpb correction average deadtime
-
source:
Sea Ice ATBD
-
units:
ns
/gt3r/sea_ice_segments/stats/ds_si_hist_bins[
ds_si_hist_bins=
0
..220]
(Type is Int32)
-
attributes
-
contentType:
auxiliaryInformation
-
description:
Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.
-
long_name:
Sea Ice Histogram Bins Dimension Scale
-
source:
SeaIce ATBD
-
units:
1
/gt3r/sea_ice_segments/stats/fpb_strength[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction strength
-
long_name:
fpb correction strength
-
source:
Sea Ice ATBD
-
units:
photons/shot
/gt3r/sea_ice_segments/stats/bsnow_con[
delta_time=
0
..278029]
(Type is Int8)
-
attributes
-
_FillValue:
127
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow confidence
-
long_name:
Blowing snow confidence
-
source:
ATL09
-
units:
1
/gt3r/sea_ice_segments/stats/layer_flag[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
contentType:
qualityInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.
-
flag_meanings:
likely_clear likely_cloudy
-
flag_values:
0, 1
-
long_name:
Consolidated cloud flag
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
1
-
valid_min:
0
/gt3r/sea_ice_segments/stats/hist_photon_bin_size[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
bin size of photon height histogram
-
long_name:
height histogram bin size
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/backgr_calc[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Calculated background count rate based on sun angle, surface slope, unit reflectance
-
long_name:
background count rate calculated
-
source:
ATBD, section 4.2.3
-
units:
hz
/gt3r/sea_ice_segments/stats/fpb_corr[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated first-photon bias(fpb) correction to mean segment height
-
long_name:
first photon bias correction
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/stats/bsnow_h[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Blowing snow layer top height
-
long_name:
Blowing snow top h
-
source:
ATL09
-
units:
meters
/gt3r/sea_ice_segments/stats/hist_photon_bottom[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
lower bound of height histogram
-
long_name:
height histogram minimum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/background_r_norm[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background rate normalized to a fixed solar elevation angle
-
long_name:
Normalized background (50-shot)
-
source:
ATBD section 4.3.1.3
-
units:
hz
/gt3r/sea_ice_segments/stats/exmax_mean_2[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 2
-
long_name:
Exmax Mean 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3r/sea_ice_segments/stats/background_int_height[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span
-
long_name:
Height of column used in background calculation
-
source:
ATBD, section 7.3
-
units:
meters
/gt3r/sea_ice_segments/stats/n_photons_actual[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons gathered
-
long_name:
Number of photons found for the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3r/sea_ice_segments/stats/ice_conc[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
sea ice concentration
-
long_name:
sea ice concentration
-
source:
ATBD, section 3.1.4
-
units:
1
/gt3r/sea_ice_segments/stats/exmax_stdev_2[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 2
-
long_name:
Exmax Stdev 2
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3r/sea_ice_segments/stats/cloud_flag_asr[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown
-
flag_meanings:
clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown
-
flag_values:
0, 1, 2, 3, 4, 5, 6
-
long_name:
Cloud Flag ASR
-
source:
Atmosphere ATBD
-
units:
1
-
valid_max:
6
-
valid_min:
0
/gt3r/sea_ice_segments/stats/exmax_stdev_1[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height standard deviation 1
-
long_name:
Exmax Stdev 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3r/sea_ice_segments/stats/fpb_corr_width[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
FPB correction width
-
long_name:
fpb correction width
-
source:
Sea Ice ATBD
-
units:
ns
/gt3r/sea_ice_segments/stats/height_coarse_stdev[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height standard deviation of coarse tracker
-
long_name:
Coarse Height Sdev
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3r/sea_ice_segments/stats/height_filter_05[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height fifth percentile used in the ssh height filter
-
long_name:
Height Filter 5th Percentile
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3r/sea_ice_segments/stats/n_photons_used[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons in the trimmed histogram.
-
long_name:
Number of photons used for fit
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3r/sea_ice_segments/stats/backgr_r_200[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on ATLAS 50 pulse counts
-
long_name:
Background rate 200 hz
-
source:
ATL09
-
units:
hz
/gt3r/sea_ice_segments/stats/hist_photon_top[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
upper bound of height histogram
-
long_name:
height histogram maximum
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/hist_w[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Segment histogram width estimate
-
long_name:
Segment histogram width estimate
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/hist_mean_h[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Mean of the n_fit_photons heights
-
long_name:
photon heights mean
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/height_coarse_mn[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
height mean of coarse tracker
-
long_name:
Coarse Track Height Mean
-
source:
sea ice ATBD , sect 4.2.1.2
-
units:
meters
/gt3r/sea_ice_segments/stats/exmax_mean_1[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mean 1
-
long_name:
Exmax Mean 1
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3r/sea_ice_segments/stats/hist_photon_heights[
delta_time=
0
..278029]
[
ds_si_hist_bins=
0
..220]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Histogram of the n_fit_photons heights
-
long_name:
photon heights histogram
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3r/sea_ice_segments/stats/trim_height_top[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
maximum height of trimmed photons used in the surface calculation procedure
-
long_name:
maximum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/exmax_mix[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
modelResult
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
exmax height mix ratio
-
long_name:
Exmax Mix
-
source:
sea ice ATBD Appendix E
-
units:
meters
/gt3r/sea_ice_segments/stats/asr_25[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Apparent surface reflectance at 25 hz, averaged to the sea ice segment.
-
long_name:
Apparent Surface Reflectance 25hz
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/stats/photon_rate[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
photon count rate, averaged over segment
-
long_name:
photon rate
-
source:
ATBD, section 4.2.2.4
-
units:
photons/shot
/gt3r/sea_ice_segments/stats/trim_height_bottom[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
minimum height of trimmed photons used in the surface calculation procedure
-
long_name:
minimum height of trimmed photons
-
source:
ATBD, section 4.2.2.4
-
units:
meters
/gt3r/sea_ice_segments/stats/n_photons_define[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
_FillValue:
-1
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Number of photons to gather.
-
long_name:
Number of photons defining the segment
-
source:
ATBD, section 4.2.2.4
-
units:
1
/gt3r/sea_ice_segments/stats/backgr_r_25[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Background count rate, averaged over the segment based on 25 hz atmosphere
-
long_name:
Background rate 25hz
-
source:
ATL09
-
units:
hz
/gt3r/sea_ice_segments/geolocation/rgt[
delta_time=
0
..278029]
(Type is Int16)
-
attributes
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
-
long_name:
Reference Ground track
-
source:
Sea Ice ATBD
-
units:
1
-
valid_max:
1387
-
valid_min:
1
/gt3r/sea_ice_segments/geolocation/sigma_lon[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group.
-
long_name:
longitude uncertainty
-
source:
Sea Ice ATBD
-
units:
degrees
/gt3r/sea_ice_segments/geolocation/ref_atm_delay[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay, in range, for the reference photon.
-
long_name:
Reference Photon Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters
/gt3r/sea_ice_segments/geolocation/beam_azimuth[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees.
-
long_name:
beam azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt3r/sea_ice_segments/geolocation/solar_azimuth[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
-
long_name:
solar azimuth
-
source:
Sea Ice ATBD
-
units:
degrees_east
/gt3r/sea_ice_segments/geolocation/ref_atm_delay_derivative[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter.
-
long_name:
Derivative of Atm. Path Delay
-
source:
Sea Ice ATBD
-
units:
meters/meter
/gt3r/sea_ice_segments/geolocation/sigma_lat[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group
-
long_name:
latitude uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/geolocation/beam_coelev[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
-
long_name:
beam co-elevation
-
source:
Sea Ice ATBD
-
units:
degrees
/gt3r/sea_ice_segments/geolocation/sigma_h[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
_FillValue:
3.402823466e+38
-
contentType:
referenceInformation
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below.
-
long_name:
height uncertainty
-
source:
Sea Ice ATBD
-
units:
1
/gt3r/sea_ice_segments/geolocation/solar_elevation[
delta_time=
0
..278029]
(Type is Float32)
-
attributes
-
contentType:
physicalMeansurement
-
coordinates:
../delta_time ../latitude ../longitude
-
description:
Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
-
long_name:
solar elevation
-
source:
Sea Ice ATBD
-
units:
degrees
