Dataset Information

time_reference: 1980-01-06T00:00:00Z
format_version: 2
product_type: RADT
sdpc_version: TEMPO_SDPC_v4.8.3
scan_num: 18
granule_num: 3
processing_version: 4
scan_type: 3
time_coverage_start: 2026-04-30T01:39:37Z
time_coverage_end: 2026-04-30T01:52:08Z
time_coverage_start_since_epoch: 1461548395.957442
time_coverage_end_since_epoch: 1461549146.310597
production_date_time: 2026-04-30T02:11:07Z
version_id: 4
pge_version: 0.1.0
shortname: TEMPO_RADT_L1
begin_date: 2026-04-30
begin_time: 01:39:37
end_date: 2026-04-30
end_time: 01:52:08
inr_status: 2
processing_level: 1
history: 2026-04-30T02:11:14Z: /proj/sdpc_soft/install/gnu-rocky8/sdpc/v4p8p3/bin/L0_ccd -vv --Version 4 --config l0_ccd_drk.cfg -i @hk.lis --solar /proj/sdpc_archive/temposdpc/ops5/L1/IRR/D16908/20260423T040511Z/TEMPO_IRR_L1_V04_20260423T040511Z.nc --trend trend_params.nc -d /proj/sdpc_archive/temposdpc/ops5/L1/DRK/D16915/20260429T095813Z/TEMPO_DRK_L1_V04_20260429T095813Z.nc -o TEMPO_RADT_L1_V04_20260430T013937Z_S018G03.nc TEMPO_RADT_L0_V01_20260430T013937Z_S018G03.nc 2026-04-30T02:13:01Z: /proj/sdpc_soft/install/gnu-rocky8/sdpc/v4p8p3/bin/L1_inr_prep -v 1 -i /proj/sdpc_archive/ancillary/var/iers/files/bulletina_2026113_xxxix_017.txt TEMPO_RADT_L1_V04_20260430T013937Z_S018G03.nc 2026-04-30T02:18:15Z: /proj/sdpc_soft/install/gnu-rocky8/sdpc/v4p8p3/bin/L1_inr_post -vv -c /proj/sdpc/liveroot/temposdpc/ops5/etc/l1_inr_post.cfg -s /proj/sdpc_archive/ancillary/var/ims/2026/ims2026119_1km_v1.3.nc TEMPO_RADT_L1_V04_20260430T013937Z_S018G03.nc
input_files: TEMPO_RADT_L0_V01_20260430T013937Z_S018G03.nc, TEMPO_HK_L0_V01_20260430T013411Z.nc, TEMPO_HK_L0_V01_20260430T013841Z.nc, TEMPO_HK_L0_V01_20260430T014311Z.nc, TEMPO_HK_L0_V01_20260430T014753Z.nc, TEMPO_IRR_L1_V04_20260423T040511Z.nc, TEMPO_DRK_L1_V04_20260429T095813Z.nc, TEMPO_SMC_L0_V01_20260430T013540Z.nc, TEMPO_SMC_L0_V01_20260430T014038Z.nc, TEMPO_SMC_L0_V01_20260430T014441Z.nc, TEMPO_SMC_L0_V01_20260430T014938Z.nc, TEMPO_IRU_L0_V01_20260430T013509Z.nc, TEMPO_IRU_L0_V01_20260430T013925Z.nc, TEMPO_IRU_L0_V01_20260430T014341Z.nc, TEMPO_IRU_L0_V01_20260430T014741Z.nc, TEMPO_IRU_L0_V01_20260430T015156Z.nc
local_granule_id: TEMPO_RADT_L1_V04_20260430T013937Z_S018G03.nc
Conventions: CF-1.6, ACDD-1.3
day_of_year: Attribute elided: Unsupported attribute type (NC_INT64)
project: TEMPO
platform: Intelsat 40e
source: UV-VIS hyperspectral imaging
institution: Smithsonian Astrophysical Observatory
creator_url: http://tempo.si.edu
title: TEMPO Level 1 twilight radiance measurement
collection_shortname: TEMPO_RADT_L1
collection_version: Attribute elided: Unsupported attribute type (NC_INT64)
keywords: EARTH SCIENCE>SPECTRAL/ENGINEERING>VISIBLE WAVELENGTHS>VISIBLE RADIANCE, EARTH SCIENCE>SPECTRAL/ENGINEERING>ULTRAVIOLET WAVELENGTHS>ULTRAVIOLET RADIANCE
summary: Level 1 twilight radiance files provide radiance measured during twilight hours to capture city lights at TEMPO’s native spatial resolution, ~10 km^2 at the center of the Field of Regard (FOR), for individual granules. Each granule covers the entire North-South TEMPO FOR but only a portion of the East-West FOR. The files are provided in netCDF4 format, and contain information on radiometrically calibrated and geolocated radiances for the UV and visible bands, corresponding noise, geolocation, viewing geometry, quality flags and other ancillary information. The product is produced using the L0-1b processor which includes image processing steps to produce radiometrically calibrated radiances with nominal navigation. Please refer to the ATBD for details.
coremetadata: GROUP = INVENTORYMETADATA GROUPTYPE = MASTERGROUP GROUP = ECSDATAGRANULE OBJECT = LOCALGRANULEID NUM_VAL = 1 VALUE = "TEMPO_RADT_L1_V04_20260430T013937Z_S018G03.nc" END_OBJECT = LOCALGRANULEID OBJECT = LOCALVERSIONID NUM_VAL = 1 VALUE = ("RFC1321 MD5 = not yet calculated") END_OBJECT = LOCALVERSIONID OBJECT = PRODUCTIONDATETIME NUM_VAL = 1 VALUE = "2026-04-30T02:11:07Z" END_OBJECT = PRODUCTIONDATETIME END_GROUP = ECSDATAGRANULE GROUP = COLLECTIONDESCRIPTIONCLASS OBJECT = SHORTNAME NUM_VAL = 1 VALUE = "TEMPO_RADT_L1" END_OBJECT = SHORTNAME OBJECT = VERSIONID NUM_VAL = 1 VALUE = 4 END_OBJECT = VERSIONID END_GROUP = COLLECTIONDESCRIPTIONCLASS GROUP = INPUTGRANULE OBJECT = INPUTPOINTER NUM_VAL = 16 VALUE = ("TEMPO_RADT_L0_V01_20260430T013937Z_S018G03.nc", "TEMPO_HK_L0_V01_20260430T013411Z.nc", "TEMPO_HK_L0_V01_20260430T013841Z.nc", "TEMPO_HK_L0_V01_20260430T014311Z.nc", "TEMPO_HK_L0_V01_20260430T014753Z.nc", "TEMPO_IRR_L1_V04_20260423T040511Z.nc", "TEMPO_DRK_L1_V04_20260429T095813Z.nc", "TEMPO_SMC_L0_V01_20260430T013540Z.nc", "TEMPO_SMC_L0_V01_20260430T014038Z.nc", "TEMPO_SMC_L0_V01_20260430T014441Z.nc", "TEMPO_SMC_L0_V01_20260430T014938Z.nc", "TEMPO_IRU_L0_V01_20260430T013509Z.nc", "TEMPO_IRU_L0_V01_20260430T013925Z.nc", "TEMPO_IRU_L0_V01_20260430T014341Z.nc", "TEMPO_IRU_L0_V01_20260430T014741Z.nc", "TEMPO_IRU_L0_V01_20260430T015156Z.nc") END_OBJECT = INPUTPOINTER END_GROUP = INPUTGRANULE GROUP = SPATIALDOMAINCONTAINER GROUP = HORIZONTALSPATIALDOMAINCONTAINER GROUP = GPOLYGON OBJECT = GPOLYGONCONTAINER CLASS = "1" GROUP = GRINGPOINT CLASS = "1" OBJECT = GRINGPOINTLONGITUDE NUM_VAL = 16 CLASS = "1" VALUE = (-103.1601, -101.8283, -100.6888, -99.7562, -98.9429, -98.3345, -97.8363, -97.4732, -97.2139, -92.0848, -92.1102, -92.2956, -92.6113, -93.0675, -103.1221, -103.1601) END_OBJECT = GRINGPOINTLONGITUDE OBJECT = GRINGPOINTLATITUDE NUM_VAL = 16 CLASS = "1" VALUE = (57.8383, 53.8585, 49.4598, 44.8112, 39.5318, 34.3516, 28.7184, 23.0695, 17.2029, 17.186, 26.9644, 38.7695, 48.9757, 57.6206, 57.8538, 57.8383) END_OBJECT = GRINGPOINTLATITUDE OBJECT = GRINGPOINTSEQUENCENO NUM_VAL = 16 CLASS = "1" VALUE = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16) END_OBJECT = GRINGPOINTSEQUENCENO END_GROUP = GRINGPOINT GROUP = GRING CLASS = "1" OBJECT = EXCLUSIONGRINGFLAG NUM_VAL = 1 VALUE = "N" CLASS = "1" END_OBJECT = EXCLUSIONGRINGFLAG END_GROUP = GRING END_OBJECT = GPOLYGONCONTAINER END_GROUP = GPOLYGON END_GROUP = HORIZONTALSPATIALDOMAINCONTAINER END_GROUP = SPATIALDOMAINCONTAINER GROUP = RANGEDATETIME OBJECT = RANGEENDINGDATE NUM_VAL = 1 VALUE = "2026-04-30" END_OBJECT = RANGEENDINGDATE OBJECT = RANGEENDINGTIME NUM_VAL = 1 VALUE = "01:52:08" END_OBJECT = RANGEENDINGTIME OBJECT = RANGEBEGINNINGDATE NUM_VAL = 1 VALUE = "2026-04-30" END_OBJECT = RANGEBEGINNINGDATE OBJECT = RANGEBEGINNINGTIME NUM_VAL = 1 VALUE = "01:39:37" END_OBJECT = RANGEBEGINNINGTIME END_GROUP = RANGEDATETIME GROUP = PGEVERSIONCLASS OBJECT = PGEVERSION NUM_VAL = 1 VALUE = "0.1.0" END_OBJECT = PGEVERSION END_GROUP = PGEVERSIONCLASS END_GROUP = INVENTORYMETADATA END
geospatial_bounds: POLYGON((57.8383 -103.1601,53.8585 -101.8283,49.4598 -100.6888,44.8112 -99.7562,39.5318 -98.9429,34.3516 -98.3345,28.7184 -97.8363,23.0695 -97.4732,17.2029 -97.2139,17.1860 -92.0848,26.9644 -92.1102,38.7695 -92.2956,48.9757 -92.6113,57.6206 -93.0675,57.8538 -103.1221,57.8383 -103.1601))
geospatial_bounds_crs: EPSG:4326
geospatial_lon_min: -103.160126
geospatial_lon_max: -92.0847778
geospatial_lat_min: 17.1859951
geospatial_lat_max: 57.8537827


Variables in this Dataset

granule_flag: 32 bit Integer
long_name: granule processing label
flag_meanings: is_first_granule_of_scan is_last_granule_of_scan is_telemetry_only scan_seq_start
flag_masks: 1, 2, 4, 8
mirror_step: Array of 32 bit Integers [mirror_step = 0..116]
long_name: scan mirror position index
time: Grid
standard_name: time
long_name: exposure start time
calendar: gregorian
units: seconds since 1980-01-06T00:00:00Z
time: Array of 64 bit Reals [mirror_step = 0..116]
standard_name: time
long_name: exposure start time
calendar: gregorian
units: seconds since 1980-01-06T00:00:00Z
mirror_step: Array of 32 bit Integers [mirror_step = 0..116]
long_name: scan mirror position index
exposure_time: Grid
units: seconds
long_name: exposure duration
valid_min: 0.00000000
_FillValue: 9.96920997e+36
valid_max: 300.000000
exposure_time: Array of 32 bit Reals [mirror_step = 0..116]
units: seconds
long_name: exposure duration
valid_min: 0.00000000
_FillValue: 9.96920997e+36
valid_max: 300.000000
mirror_step: Array of 32 bit Integers [mirror_step = 0..116]
long_name: scan mirror position index
earth_sun_distance: 32 bit Real
units: m
long_name: Earth-sun distance
east_ref_sat_ID: 32 bit Integer
comment: The ID of reference satellite used in the East, 0 indicating no reference satellite is used from the East slot
west_ref_sat_ID: 32 bit Integer
comment: The ID of reference satellite used in the West, 0 indicating no reference satellite is used from the West slot
VIIRS_registration_status: 16 bit Integer
_FillValue: -127
comment: twilight registration status fail=0 success=1
VIIRS_product_name: String
comment: VIIRS product used for registration and collocated radiances