Dataset Information

HDF5_OBJ_FULLPATH: /Metadata/Extent/Global/
description: Freeze-thaw binary state is retrieved from gridded radiometer data on both descending (AM, fore/aft) and ascending (PM, fore/aft) SMAP half-orbits. The L3_FT_P product includes global projection data at all latitudes. Freeze-thaw state retrieval is inhibited for areas with permanent snow/ice and excessive static or transient open water in the cell, and when there is excessive RFI in the sensor data. Retrievals may be flagged as questionable for urban areas, mountainous areas with high elevation variability, and for cells in which the seasonal (thawed-frozen) reference difference is much smaller than the radiometer measurement error.
eastBoundLongitude: 180.
westBoundLongitude: -180.
southBoundLatitude: -85.04450226
northBoundLatitude: 85.04450226
HDF5_OBJ_FULLPATH: /Metadata/GridSpatialRepresentation/Global/
orientationParameterAvailability: 0
transformationParameterAvailability: 0
controlPointAvailability: 0
HDF5_OBJ_FULLPATH: /Metadata/GridSpatialRepresentation/Global/Column/
dimensionSize: 3856
resolution: 9.
HDF5_OBJ_FULLPATH: /Metadata/GridSpatialRepresentation/Global/Row/
dimensionSize: 1624
resolution: 9.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/thaw_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate thawed conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/retrieval_algorithm_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether the NPR change detection algorithm or the single-channel V-pol threshold algorithm was used to retrieve freeze-thaw state. A value of 0 indicates the NPR algorithm, a value of 1 indicates the SCV algorithm. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/landcover_class
_FillValue: 254
long_name: An enumerated type that specifies the predominant surface vegetation found in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/EASE_row_index
valid_min: 0
long_name: The row index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 65535
_FillValue: 65534
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/FT_SCV_threshold
valid_min: -999999.875
long_name: Threshold for the SCV algorithm based on reference V-pol TB to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the vertical polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Vertical_polarization_quality Vertical_polarization_range Vertical_polarization_RFI_detection Vertical_polarization_RFI_correction Vertical_polarization_NEDT Vertical_polarization_direct_sun_correction Vertical_polarization_reflected_sun_correction Vertical_polarization_reflected_moon_correction Vertical_polarization_direct_galaxy_correction Vertical_polarization_reflected_galaxy_correction Vertical_polarization_atmosphere_correction Vertical_polarization_Faraday_rotation_correction Vertical_polarization_null_value_bit Vertical_polarization_water_correction Vertical_polarization_RFI_check Vertical_polarization_RFI_clean
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/open_water_body_fraction
valid_min: 0.
long_name: Fraction of the area of the grid cell surface covered by open water. Open water areas do not have vegetation at or on the water surface. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 1.
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_utc
long_name: Time of the freeze-thaw determination for this particular element in UTC. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/longitude
units: degrees_east
long_name: Longitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/transition_state_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil is in transitional state from AM to PM on the same day. 0 indicates state is not in transition, 1 indicates state is in transition.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/latitude
units: degrees_north
long_name: Latitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/altitude_std_dev
units: meters
long_name: The standard deviation of the Earth surface elevation within the grid cell. This element provides a surface roughness measure. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 1000.
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/retrieval_qual_flag
_FillValue: 65534
long_name: Sequence of bit flags that indicate the conditions and the quality of the freeze-thaw retrieval. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s
flag_meanings: FT_Retrieval_attempted_flag High_water_fraction_flag Permanent_ice_flag Low_SCV_correlation_flag FT_mitigation_flag
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the horizontal polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Horizontal_polarization_quality Horizontal_polarization_range Horizontal_polarization_RFI_detection Horizontal_polarization_RFI_correction Horizontal_polarization_NEDT Horizontal_polarization_direct_sun_correction Horizontal_polarization_reflected_sun_correction Horizontal_polarization_reflected_moon_correction Horizontal_polarization_direct_galaxy_correction Horizontal_polarization_reflected_galaxy_correction Horizontal_polarization_atmosphere_correction Horizontal_polarization_Faraday_rotation_correction Horizontal_polarization_null_value_bit Horizontal_polarization_water_correction Horizontal_polarization_RFI_check Horizontal_polarization_RFI_clean
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/transition_direction
valid_min: 0
valid_max: 1
long_name: Boolean that indicates transitional direction. 0 indicates AM frozen, PM thawed, 1 indicates AM thawed, PM frozen. Value is always zero if not in transition state.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_error
units: Kelvin
long_name: Overall error measure for V-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_mean
units: Kelvin
long_name: Mean of H-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil within cell is frozen or thawed. A value of 0 implies thawed conditions, a value of 1 implies frozen. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/data_sampling_density
units: km
long_name: Total number of radiometer data samples in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 2.
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/EASE_column_index
valid_min: 0
valid_max: 65535
long_name: The column index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 65534
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_seconds
units: seconds
long_name: Time of the freeze-thaw determination for this particular element in seconds from the standard epoch. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.90000000002
valid_max: 999999.90000000002
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_mean
units: Kelvin
long_name: Mean of V-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/surface_flag
long_name: Bit flags that record ambient surface conditions for the grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 65534
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s
flag_meanings: 9_km_static_water_body_flag 9_km_high_static_water_body_fraction_flag 9_km_coastal_proximity_flag 9_km_urban_area_flag 9_km_precipitation_flag 9_km_snow_or_ice_flag 9_km_permanent_snow_or_ice_flag 9_km_radiometer_frozen_ground_flag 9_km_model_frozen_ground_flag 9_km_mountainous_terrain_flag 9_km_dense_vegetation_flag 9_km_nadir_region_flag
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/altitude_dem
units: meters
long_name: The Earth surface elevation within the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_error
units: Kelvin
long_name: Overall error measure for H-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate frozen conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/normalized_polarization_ratio
valid_min: -5.
long_name: Normalized Tb polarization ratio at the Earth based grid cell, defined as (TBH-TBV)/(TBH+TBV). The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 5.
_FillValue: -9999.
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/reference_image_threshold
valid_min: -999999.875
long_name: Threshold based on reference freeze and thaw to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.

Variables in this Dataset

/Freeze_Thaw_Retrieval_Data_Polar/thaw_reference: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/thaw_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate thawed conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/retrieval_algorithm_flag: Array of Bytes [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/retrieval_algorithm_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether the NPR change detection algorithm or the single-channel V-pol threshold algorithm was used to retrieve freeze-thaw state. A value of 0 indicates the NPR algorithm, a value of 1 indicates the SCV algorithm. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Polar/landcover_class: Array of Bytes [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/landcover_class
_FillValue: 254
long_name: An enumerated type that specifies the predominant surface vegetation found in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
/Freeze_Thaw_Retrieval_Data_Polar/EASE_row_index: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/EASE_row_index
valid_min: 0
long_name: The row index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 65535
_FillValue: 65534
/Freeze_Thaw_Retrieval_Data_Polar/FT_SCV_threshold: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/FT_SCV_threshold
valid_min: -999999.875
long_name: Threshold for the SCV algorithm based on reference V-pol TB to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/tbv_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbv_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the vertical polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Vertical_polarization_quality Vertical_polarization_range Vertical_polarization_RFI_detection Vertical_polarization_RFI_correction Vertical_polarization_NEDT Vertical_polarization_direct_sun_correction Vertical_polarization_reflected_sun_correction Vertical_polarization_reflected_moon_correction Vertical_polarization_direct_galaxy_correction Vertical_polarization_reflected_galaxy_correction Vertical_polarization_atmosphere_correction Vertical_polarization_Faraday_rotation_correction Vertical_polarization_null_value_bit Vertical_polarization_water_correction Vertical_polarization_RFI_check Vertical_polarization_RFI_clean
/Freeze_Thaw_Retrieval_Data_Polar/open_water_body_fraction: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/open_water_body_fraction
valid_min: 0.
long_name: Fraction of the area of the grid cell surface covered by open water. Open water areas do not have vegetation at or on the water surface. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 1.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw_time_utc: Array of Strings [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw_time_utc
long_name: Time of the freeze-thaw determination for this particular element in UTC. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
/Freeze_Thaw_Retrieval_Data_Polar/longitude: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/longitude
units: degrees_east
long_name: Longitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
/Freeze_Thaw_Retrieval_Data_Polar/transition_state_flag: Array of Bytes [ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/transition_state_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil is in transitional state from AM to PM on the same day. 0 indicates state is not in transition, 1 indicates state is in transition.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Polar/latitude: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/latitude
units: degrees_north
long_name: Latitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
/Freeze_Thaw_Retrieval_Data_Polar/altitude_std_dev: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/altitude_std_dev
units: meters
long_name: The standard deviation of the Earth surface elevation within the grid cell. This element provides a surface roughness measure. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: 0.
valid_max: 1000.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/retrieval_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/retrieval_qual_flag
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
long_name: Sequence of bit flags that indicate the conditions and the quality of the freeze-thaw retrieval. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
_FillValue: 65534
flag_masks: 1s, 2s, 4s, 8s, 16s
flag_meanings: FT_Retrieval_attempted_flag High_water_fraction_flag Permanent_ice_flag Low_SCV_correlation_flag FT_mitigation_flag
/Freeze_Thaw_Retrieval_Data_Polar/tbh_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbh_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the horizontal polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Horizontal_polarization_quality Horizontal_polarization_range Horizontal_polarization_RFI_detection Horizontal_polarization_RFI_correction Horizontal_polarization_NEDT Horizontal_polarization_direct_sun_correction Horizontal_polarization_reflected_sun_correction Horizontal_polarization_reflected_moon_correction Horizontal_polarization_direct_galaxy_correction Horizontal_polarization_reflected_galaxy_correction Horizontal_polarization_atmosphere_correction Horizontal_polarization_Faraday_rotation_correction Horizontal_polarization_null_value_bit Horizontal_polarization_water_correction Horizontal_polarization_RFI_check Horizontal_polarization_RFI_clean
/Freeze_Thaw_Retrieval_Data_Polar/transition_direction: Array of Bytes [ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/transition_direction
valid_min: 0
valid_max: 1
long_name: Boolean that indicates transitional direction. 0 indicates AM frozen, PM thawed, 1 indicates AM thawed, PM frozen. Value is always zero if not in transition state.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Polar/tbv_error: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbv_error
units: Kelvin
long_name: Overall error measure for V-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/tbh_mean: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbh_mean
units: Kelvin
long_name: Mean of H-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw: Array of Bytes [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil within cell is frozen or thawed. A value of 0 implies thawed conditions, a value of 1 implies frozen. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Polar/data_sampling_density: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/data_sampling_density
units: km
long_name: Total number of radiometer data samples in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: 0.
valid_max: 2.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/EASE_column_index: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/EASE_column_index
valid_min: 0
valid_max: 65535
long_name: The column index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 65534
/Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw_time_seconds: Array of 64 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/freeze_thaw_time_seconds
units: seconds
long_name: Time of the freeze-thaw determination for this particular element in seconds from the standard epoch. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: -999999.90000000002
valid_max: 999999.90000000002
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/tbv_mean: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbv_mean
units: Kelvin
long_name: Mean of V-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/surface_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/surface_flag
long_name: Bit flags that record ambient surface conditions for the grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
_FillValue: 65534
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s
flag_meanings: 9_km_static_water_body_flag 9_km_high_static_water_body_fraction_flag 9_km_coastal_proximity_flag 9_km_urban_area_flag 9_km_precipitation_flag 9_km_snow_or_ice_flag 9_km_permanent_snow_or_ice_flag 9_km_radiometer_frozen_ground_flag 9_km_model_frozen_ground_flag 9_km_mountainous_terrain_flag 9_km_dense_vegetation_flag 9_km_nadir_region_flag
/Freeze_Thaw_Retrieval_Data_Polar/altitude_dem: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/altitude_dem
units: meters
long_name: The Earth surface elevation within the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: 0.
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/tbh_error: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/tbh_error
units: Kelvin
long_name: Overall error measure for H-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/freeze_reference: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/freeze_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate frozen conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/normalized_polarization_ratio: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/normalized_polarization_ratio
valid_min: -5.
long_name: Normalized Tb polarization ratio at the Earth based grid cell, defined as (TBH-TBV)/(TBH+TBV). The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 5.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Polar/reference_image_threshold: Array of 32 bit Reals [ = 0..1][ = 0..1999][ = 0..1999]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Polar/reference_image_threshold
valid_min: -999999.875
long_name: Threshold based on reference freeze and thaw to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Polar/latitude /Freeze_Thaw_Retrieval_Data_Polar/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/thaw_reference: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/thaw_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate thawed conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/retrieval_algorithm_flag: Array of Bytes [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/retrieval_algorithm_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether the NPR change detection algorithm or the single-channel V-pol threshold algorithm was used to retrieve freeze-thaw state. A value of 0 indicates the NPR algorithm, a value of 1 indicates the SCV algorithm. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Global/landcover_class: Array of Bytes [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/landcover_class
_FillValue: 254
long_name: An enumerated type that specifies the predominant surface vegetation found in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
/Freeze_Thaw_Retrieval_Data_Global/EASE_row_index: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/EASE_row_index
valid_min: 0
long_name: The row index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 65535
_FillValue: 65534
/Freeze_Thaw_Retrieval_Data_Global/FT_SCV_threshold: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/FT_SCV_threshold
valid_min: -999999.875
long_name: Threshold for the SCV algorithm based on reference V-pol TB to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/tbv_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the vertical polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Vertical_polarization_quality Vertical_polarization_range Vertical_polarization_RFI_detection Vertical_polarization_RFI_correction Vertical_polarization_NEDT Vertical_polarization_direct_sun_correction Vertical_polarization_reflected_sun_correction Vertical_polarization_reflected_moon_correction Vertical_polarization_direct_galaxy_correction Vertical_polarization_reflected_galaxy_correction Vertical_polarization_atmosphere_correction Vertical_polarization_Faraday_rotation_correction Vertical_polarization_null_value_bit Vertical_polarization_water_correction Vertical_polarization_RFI_check Vertical_polarization_RFI_clean
/Freeze_Thaw_Retrieval_Data_Global/open_water_body_fraction: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/open_water_body_fraction
valid_min: 0.
long_name: Fraction of the area of the grid cell surface covered by open water. Open water areas do not have vegetation at or on the water surface. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 1.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_utc: Array of Strings [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_utc
long_name: Time of the freeze-thaw determination for this particular element in UTC. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
/Freeze_Thaw_Retrieval_Data_Global/longitude: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/longitude
units: degrees_east
long_name: Longitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
/Freeze_Thaw_Retrieval_Data_Global/transition_state_flag: Array of Bytes [ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/transition_state_flag
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil is in transitional state from AM to PM on the same day. 0 indicates state is not in transition, 1 indicates state is in transition.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Global/latitude: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/latitude
units: degrees_north
long_name: Latitude of the center of the Earth based grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
/Freeze_Thaw_Retrieval_Data_Global/altitude_std_dev: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/altitude_std_dev
units: meters
long_name: The standard deviation of the Earth surface elevation within the grid cell. This element provides a surface roughness measure. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 1000.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/retrieval_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/retrieval_qual_flag
_FillValue: 65534
long_name: Sequence of bit flags that indicate the conditions and the quality of the freeze-thaw retrieval. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s
flag_meanings: FT_Retrieval_attempted_flag High_water_fraction_flag Permanent_ice_flag Low_SCV_correlation_flag FT_mitigation_flag
/Freeze_Thaw_Retrieval_Data_Global/tbh_qual_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_qual_flag
_FillValue: 65534
long_name: Bit flags that represent the quality of the horizontal polarization brightness temperature within each grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s
flag_meanings: Horizontal_polarization_quality Horizontal_polarization_range Horizontal_polarization_RFI_detection Horizontal_polarization_RFI_correction Horizontal_polarization_NEDT Horizontal_polarization_direct_sun_correction Horizontal_polarization_reflected_sun_correction Horizontal_polarization_reflected_moon_correction Horizontal_polarization_direct_galaxy_correction Horizontal_polarization_reflected_galaxy_correction Horizontal_polarization_atmosphere_correction Horizontal_polarization_Faraday_rotation_correction Horizontal_polarization_null_value_bit Horizontal_polarization_water_correction Horizontal_polarization_RFI_check Horizontal_polarization_RFI_clean
/Freeze_Thaw_Retrieval_Data_Global/transition_direction: Array of Bytes [ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/transition_direction
valid_min: 0
valid_max: 1
long_name: Boolean that indicates transitional direction. 0 indicates AM frozen, PM thawed, 1 indicates AM thawed, PM frozen. Value is always zero if not in transition state.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Global/tbv_error: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_error
units: Kelvin
long_name: Overall error measure for V-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/tbh_mean: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_mean
units: Kelvin
long_name: Mean of H-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/freeze_thaw: Array of Bytes [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw
valid_min: 0
valid_max: 1
long_name: Boolean that indicates whether soil within cell is frozen or thawed. A value of 0 implies thawed conditions, a value of 1 implies frozen. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 254
/Freeze_Thaw_Retrieval_Data_Global/data_sampling_density: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/data_sampling_density
units: km
long_name: Total number of radiometer data samples in the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 2.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/EASE_column_index: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/EASE_column_index
valid_min: 0
valid_max: 65535
long_name: The column index of the 9 km EASE grid cell that contains the associated data. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 65534
/Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_seconds: Array of 64 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_thaw_time_seconds
units: seconds
long_name: Time of the freeze-thaw determination for this particular element in seconds from the standard epoch. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.90000000002
valid_max: 999999.90000000002
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/tbv_mean: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbv_mean
units: Kelvin
long_name: Mean of V-pol brightness temperature in the 9 km Earth grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/surface_flag: Array of 16 bit Unsigned integers [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/surface_flag
long_name: Bit flags that record ambient surface conditions for the grid cell
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
_FillValue: 65534
flag_masks: 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s
flag_meanings: 9_km_static_water_body_flag 9_km_high_static_water_body_fraction_flag 9_km_coastal_proximity_flag 9_km_urban_area_flag 9_km_precipitation_flag 9_km_snow_or_ice_flag 9_km_permanent_snow_or_ice_flag 9_km_radiometer_frozen_ground_flag 9_km_model_frozen_ground_flag 9_km_mountainous_terrain_flag 9_km_dense_vegetation_flag 9_km_nadir_region_flag
/Freeze_Thaw_Retrieval_Data_Global/altitude_dem: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/altitude_dem
units: meters
long_name: The Earth surface elevation within the grid cell. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: 0.
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/tbh_error: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/tbh_error
units: Kelvin
long_name: Overall error measure for H-pol brightness temperature within the grid cell, includes calibration, RFI and contamination effects. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_min: -999999.875
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/freeze_reference: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/freeze_reference
valid_min: -999999.875
long_name: Reference normalized polarization ratio value used as a basis to indicate frozen conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/normalized_polarization_ratio: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/normalized_polarization_ratio
valid_min: -5.
long_name: Normalized Tb polarization ratio at the Earth based grid cell, defined as (TBH-TBV)/(TBH+TBV). The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 5.
_FillValue: -9999.
/Freeze_Thaw_Retrieval_Data_Global/reference_image_threshold: Array of 32 bit Reals [ = 0..1][ = 0..1623][ = 0..3855]
HDF5_OBJ_FULLPATH: /Freeze_Thaw_Retrieval_Data_Global/reference_image_threshold
valid_min: -999999.875
long_name: Threshold based on reference freeze and thaw to differentiate between freeze and thaw conditions. The AM (dimension AMPM=0) and PM (AMPM=1) observations are stored separately in the array.
coordinates: /Freeze_Thaw_Retrieval_Data_Global/latitude /Freeze_Thaw_Retrieval_Data_Global/longitude
valid_max: 999999.875
_FillValue: -9999.