SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Operational Data Product Version D

(SWOT_L2_RAD_OGDR_D)
VersionD
Processing Level2
Start/Stop Date2022-Dec-16 to Present
Short NameSWOT_L2_RAD_OGDR_D
DescriptionThe SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Operational Geophysical Data Record (OGDR) Version D dataset produced by the Surface Water and Ocean Topography (SWOT) mission provides atmospheric water vapor and liquid water content from the Advanced Microwave Radiometer (AMR), a Jason-class radiometer that measures sea surface brightness temperatures at three microwave frequencies (18.7, 23.8 and 34 GHz). Brightness temperatures are processed to estimate the wet troposphere content, atmospheric attenuation to backscatter, cloud liquid water, water vapor content, and wind speed coincident with each range measurement from the nadir altimeter and applied to correct for altimeter range delays caused by atmospheric effects. SWOT is a joint mission between NASA and CNES that launched on December 16, 2022 and aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. The operational radiometer dataset consists of discrete measurements along two tracks located approximately 30-km to the left and right of the satellite nadir. They were processed using the onboard DORIS orbit ephemeris and preliminary calibrations. They are distributed as one file per data downlink in netCDF-4 file format with a nominal latency of < 7 hours.
DOI10.5067/SWOT-RAD-OGDR-D
MeasurementSPECTRAL/ENGINEERING > MICROWAVE > BRIGHTNESS TEMPERATURE
ATMOSPHERE > ATMOSPHERIC WATER VAPOR
SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT
ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS
CRYOSPHERE > SEA ICE
OCEANS > GEOLOGICAL FEATURES > LAND/OCEAN/ICE FRACTION
ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS
Platform/Sensor
SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
AMR
SENSOR
Name: Advanced Microwave Radiometer (AMR)
Swath Width: 18.7 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to sigma0
Swath Width: 23.8 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to water vapor
Swath Width: 34.0 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to cloud liquid water.

ProjectSurface Water Ocean Topography (SWOT)
Data ProviderPublisher: NASA/JPL/PODAAC
Creator: Surface Water Ocean Topography (SWOT)
Release Date: 2025-May-06
Resource: https://swot.jpl.nasa.gov

FormatnetCDF-4
Keyword(s)sea level, SWOT, Surface Water Ocean Topography, sea level anomaly, sla, sea surface height, ssh, sea surface height anomaly, ssha, significant wave height, swh, brightness temperature, wet troposphere correction, cloud liquid water content, water vapor content, wave height, altimetry, advanced microwave radiometer, AMR
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Coverage
Region: GLOBAL
North Bounding Coordinate: 77.6 degrees
South Bounding Coordinate: -77.6 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2022-Dec-16 to Present
 
Capabilities
Download Subset
DIRECT ACCESS
Browse Granule Listing
OPENDAP DATA
Search Granules
This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool
DIRECT S3-ACCESS
Available for access in-region with AWS Cloud
Region
us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access.

Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login.

Most of the time, you'll want to access the protected bucket Information
podaac-swot-ops-cumulus-protected/SWOT_L2_RAD_OGDR_D/
podaac-swot-ops-cumulus-public/SWOT_L2_RAD_OGDR_D/
AWS S3 Credentials
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TOOLS AND SERVICES
This dataset can be accessed with the Harmony subsetter service to subset and regrid data on-the-fly. Several subsetting options are available such as spatial, variable, temporal, and vertical level. The URL redirects to a general page with information about utilizing the service. An example query: https://harmony.earthdata.nasa.gov/C3378626164-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?subset=lat(minLat:maxLat)&subset=lon(minLon:maxLon)&subset=time(startTime:stopTime)&format=application%2Fx-netcdf4
NameLong NameUnit
/AMR_Side_1/latitudelatitude (positive N, negative S)degrees_north
/AMR_Side_1/longitudelongitude (degrees East)degrees_east
/AMR_Side_1/rad_atm_cor_sig0_ctwo-way atmospheric attenuation on C band altimeter backscatter coefficientdB
/AMR_Side_1/rad_atm_cor_sig0_c_qualquality flag for radiometer two-way atmospheric correction to C band backscatter coefficient
/AMR_Side_1/rad_atm_cor_sig0_katwo-way atmospheric attenuation on Ka band altimeter backscatter coefficientdB
/AMR_Side_1/rad_atm_cor_sig0_ka_qualquality flag for radiometer two-way atmospheric correction to Ka band backscatter coefficient
/AMR_Side_1/rad_atm_cor_sig0_kutwo-way atmospheric attenuation on Ku band altimeter backscatter coefficientdB
/AMR_Side_1/rad_atm_cor_sig0_ku_qualquality flag for radiometer two-way atmospheric correction to Ku band backscatter coefficient
/AMR_Side_1/rad_cloud_liquid_waterradiometer cloud liquid water contentkg/m^2
/AMR_Side_1/rad_cloud_liquid_water_qualquality flag for radiometer cloud liquid water content
/AMR_Side_1/rad_coordinates_qualquality flag for latitude and longitude coordinates
/AMR_Side_1/rad_distance_to_landradiometer main beam radial distance to landm
/AMR_Side_1/rad_land_frac_187land fraction within main beam of 18.7 GHz channel1
/AMR_Side_1/rad_land_frac_238land fraction within main beam of 23.8 GHz channel1
/AMR_Side_1/rad_land_frac_340land fraction within main beam of 34.0 GHz channel1
/AMR_Side_1/rad_rain_flagradiometer rain flag
/AMR_Side_1/rad_sea_ice_flagradiometer sea ice flag
/AMR_Side_1/rad_surface_type_flagradiometer surface type
/AMR_Side_1/rad_ta_187radiometer antenna temperature at 18.7 GHzK
/AMR_Side_1/rad_ta_187_qualquality flag for 18.7 GHz antenna temperature
/AMR_Side_1/rad_ta_238radiometer antenna temperature at 23.8 GHzK
/AMR_Side_1/rad_ta_238_qualquality flag for 23.8 GHz antenna temperature
/AMR_Side_1/rad_ta_340radiometer antenna temperature at 34.0 GHzK
/AMR_Side_1/rad_ta_340_qualquality flag for 34.0 GHz antenna temperature
/AMR_Side_1/rad_tb_187radiometer equalized brightness temperature at 18.7 GHzK
/AMR_Side_1/rad_tb_187_qualquality flag for 18.7 GHz equalized brightness temperature
/AMR_Side_1/rad_tb_238radiometer equalized brightness temperature at 23.8 GHzK
/AMR_Side_1/rad_tb_238_qualquality flag for 23.8 GHz equalized brightness temperature
/AMR_Side_1/rad_tb_340radiometer equalized brightness temperature at 34.0 GHzK
/AMR_Side_1/rad_tb_340_qualquality flag for 34.0 GHz equalized brightness temperature
/AMR_Side_1/rad_tmb_187radiometer main beam brightness temperature at 18.7 GHzK
/AMR_Side_1/rad_tmb_187_qualquality flag for 18.7 GHz main beam brightness temperature
/AMR_Side_1/rad_tmb_238radiometer main beam brightness temperature at 23.8 GHzK
/AMR_Side_1/rad_tmb_238_qualquality flag for 23.8 GHz main beam brightness temperature
/AMR_Side_1/rad_tmb_340radiometer main beam brightness temperature at 34.0 GHzK
/AMR_Side_1/rad_tmb_340_qualquality flag for 34.0 GHz main beam brightness temperature
/AMR_Side_1/rad_water_vaporradiometer water vapor contentkg/m^2
/AMR_Side_1/rad_water_vapor_qualquality flag for radiometer water vapor content
/AMR_Side_1/rad_wet_tropo_corradiometer wet troposphere correctionm
/AMR_Side_1/rad_wet_tropo_cor_qualquality flag for radiometer wet troposphere correction
/AMR_Side_1/rad_wind_speedradiometer wind speedm/s
/AMR_Side_1/rad_wind_speed_qualquality flag for radiometer wind speed
/AMR_Side_1/timetime in UTCseconds since 2000-01-01 00:00:00.0
/AMR_Side_1/time_taitime in TAIseconds since 2000-01-01 00:00:00.0
/AMR_Side_2/latitudelatitude (positive N, negative S)degrees_north
/AMR_Side_2/longitudelongitude (degrees East)degrees_east
/AMR_Side_2/rad_atm_cor_sig0_ctwo-way atmospheric attenuation on C band altimeter backscatter coefficientdB
/AMR_Side_2/rad_atm_cor_sig0_c_qualquality flag for radiometer two-way atmospheric correction to C band backscatter coefficient
/AMR_Side_2/rad_atm_cor_sig0_katwo-way atmospheric attenuation on Ka band altimeter backscatter coefficientdB
/AMR_Side_2/rad_atm_cor_sig0_ka_qualquality flag for radiometer two-way atmospheric correction to Ka band backscatter coefficient
/AMR_Side_2/rad_atm_cor_sig0_kutwo-way atmospheric attenuation on Ku band altimeter backscatter coefficientdB
/AMR_Side_2/rad_atm_cor_sig0_ku_qualquality flag for radiometer two-way atmospheric correction to Ku band backscatter coefficient
/AMR_Side_2/rad_cloud_liquid_waterradiometer cloud liquid water contentkg/m^2
/AMR_Side_2/rad_cloud_liquid_water_qualquality flag for radiometer cloud liquid water content
/AMR_Side_2/rad_coordinates_qualquality flag for latitude and longitude coordinates
/AMR_Side_2/rad_distance_to_landradiometer main beam radial distance to landm
/AMR_Side_2/rad_land_frac_187land fraction within main beam of 18.7 GHz channel1
/AMR_Side_2/rad_land_frac_238land fraction within main beam of 23.8 GHz channel1
/AMR_Side_2/rad_land_frac_340land fraction within main beam of 34.0 GHz channel1
/AMR_Side_2/rad_rain_flagradiometer rain flag
/AMR_Side_2/rad_sea_ice_flagradiometer sea ice flag
/AMR_Side_2/rad_surface_type_flagradiometer surface type
/AMR_Side_2/rad_ta_187radiometer antenna temperature at 18.7 GHzK
/AMR_Side_2/rad_ta_187_qualquality flag for 18.7 GHz antenna temperature
/AMR_Side_2/rad_ta_238radiometer antenna temperature at 23.8 GHzK
/AMR_Side_2/rad_ta_238_qualquality flag for 23.8 GHz antenna temperature
/AMR_Side_2/rad_ta_340radiometer antenna temperature at 34.0 GHzK
/AMR_Side_2/rad_ta_340_qualquality flag for 34.0 GHz antenna temperature
/AMR_Side_2/rad_tb_187radiometer equalized brightness temperature at 18.7 GHzK
/AMR_Side_2/rad_tb_187_qualquality flag for 18.7 GHz equalized brightness temperature
/AMR_Side_2/rad_tb_238radiometer equalized brightness temperature at 23.8 GHzK
/AMR_Side_2/rad_tb_238_qualquality flag for 23.8 GHz equalized brightness temperature
/AMR_Side_2/rad_tb_340radiometer equalized brightness temperature at 34.0 GHzK
/AMR_Side_2/rad_tb_340_qualquality flag for 34.0 GHz equalized brightness temperature
/AMR_Side_2/rad_tmb_187radiometer main beam brightness temperature at 18.7 GHzK
/AMR_Side_2/rad_tmb_187_qualquality flag for 18.7 GHz main beam brightness temperature
/AMR_Side_2/rad_tmb_238radiometer main beam brightness temperature at 23.8 GHzK
/AMR_Side_2/rad_tmb_238_qualquality flag for 23.8 GHz main beam brightness temperature
/AMR_Side_2/rad_tmb_340radiometer main beam brightness temperature at 34.0 GHzK
/AMR_Side_2/rad_tmb_340_qualquality flag for 34.0 GHz main beam brightness temperature
/AMR_Side_2/rad_water_vaporradiometer water vapor contentkg/m^2
/AMR_Side_2/rad_water_vapor_qualquality flag for radiometer water vapor content
/AMR_Side_2/rad_wet_tropo_corradiometer wet troposphere correctionm
/AMR_Side_2/rad_wet_tropo_cor_qualquality flag for radiometer wet troposphere correction
/AMR_Side_2/rad_wind_speedradiometer wind speedm/s
/AMR_Side_2/rad_wind_speed_qualquality flag for radiometer wind speed
/AMR_Side_2/timetime in UTCseconds since 2000-01-01 00:00:00.0
/AMR_Side_2/time_taitime in TAIseconds since 2000-01-01 00:00:00.0
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation Surface Water Ocean Topography (SWOT). 2025. SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Operational Data Product Version D. Ver. D. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SWOT-RAD-OGDR-D

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For more information see Data Citations and Acknowledgments.
Journal Reference Shailen Desai, 2018. Surface Water and Ocean Topography Mission (SWOT) Project: Science Requirements Document. Jet Propulsion Laboratory, JPL D-61923, Rev. B. https://swot.jpl.nasa.gov/system/documents/files/2176_2176_D-61923_SRD_Rev_B_20181113.pdf

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