Sentinel-6B/Jason-CS L2 P4 Altimeter High Resolution (HR) NRT Reduced Ocean Surface Topography
(JASON_CS_S6B_L2_ALT_HR_RED_OST_NRT_G)| Version | G |
| Processing Level | 2 |
| Start/Stop Date | 2025-Nov-17 to Present |
| Short Name | JASON_CS_S6B_L2_ALT_HR_RED_OST_NRT_G |
| Description | Provides L2 high resolution (HR) near real time (NRT; 3-hour latency) altimetry from the Poseidon-4 SAR altimeter on the Sentinel-6B spacecraft. It contains Sea Surface Height (SSH), Sea Surface Height Anomalies (SSHA) and Significant Wave Height (SWH), along with 1 Hz Ku-band measurements processed from L1B altimetry including the range, orbital altitude, time, and water vapour. It also includes altimetry corrections, significant wave height and wind-speed from the AMR-C. This release is reduced to exclude the 20 Hz observations that are included in the standard product. The S6B NRT product is analogous to the Jason-3 OGDR product. |
| DOI | 10.5067/S6BP4-2HRNR |
| Measurement | OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT OCEANS > OCEAN WAVES > SIGNIFICANT WAVE HEIGHT |
| Swath Width | 11 km |
| Platform/Sensor | Sentinel-6B / Platform Name: Sentinel-6B (Sentinel-6B) Poseidon-4 Radar Altimeter SENSOR Name: Poseidon-4 Radar Altimeter (Poseidon-4 Radar Altimeter) Sentinel-6B / Platform Name: Sentinel-6B (Sentinel-6B) AMR-C SENSOR Name: Advanced Microwave Radiometer-C (AMR-C) Sentinel-6B / Platform Name: Sentinel-6B (Sentinel-6B) DORIS SENSOR Name: Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Sentinel-6B / Platform Name: Sentinel-6B (Sentinel-6B) GNSS RECEIVER SENSOR Name: GNSS RECEIVER (GNSS RECEIVER) |
| Project | Sentinel-6B (Sentinel-6B) |
| Data Provider | Publisher: PO.DAAC Creator: Ocean Surface Topography Science Team Release Place: PO.DAAC Release Date: 2026-Jul-16 |
| Format | netCDF-4 |
| Keyword(s) | sea level, Jason-CS, Sentinel-6B, Sentinel-6B MF, S6B, Sentinel-6, Sea Level Anomaly, SLA, Sea Surface Height, SSH, Sea Surface Height Anomaly, SSHA, Significant Wave Height, SWH, Wave Height, altimeter, Jason |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Temporal Resolution: Weekly - < Monthly Coverage Region: GLOBAL OCEAN Region: GLOBAL North Bounding Coordinate: 66.15 degrees South Bounding Coordinate: -66.15 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2025-Nov-17 to PresentSwath Width: 11 km |
| DIRECT ACCESS | |
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| 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 | |
| podaac-ops-cumulus-protected/JASON_CS_S6B_L2_ALT_HR_RED_OST_NRT_G/ | |
| podaac-ops-cumulus-public/JASON_CS_S6B_L2_ALT_HR_RED_OST_NRT_G/ | |
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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 | |
| Name | Long Name | Unit |
|---|---|---|
| /data_01/altitude | center of mass altitude above the reference ellipsoid | m |
| /data_01/altitude_rate | center of mass altitude rate with respect to the reference ellipsoid | m/s |
| /data_01/altitude_rate_mean_sea_surface | center of mass altitude rate with respect to the mean sea surface | m/s |
| /data_01/amr_rain_flag | AMR rain flag | |
| /data_01/amr_sea_ice_flag | AMR sea ice flag | |
| /data_01/amr_surface_type_flag | AMR surface type | |
| /data_01/amr_wet_tropo_cor | AMR radiometer wet tropospheric correction | m |
| /data_01/amr_wet_tropo_cor_qual | quality flag for the AMR radiometer wet troposphere correction | |
| /data_01/angle_of_approach_to_coast | angle of approach to the coast | degrees |
| /data_01/climato_use_flag | flag indicating the use of climatological values for the computation of sigma0 atmospheric attenuation | |
| /data_01/dac | dynamic atmospheric correction | m |
| /data_01/dac_type_flag | flag indicating the type of dynamic atmospheric correction files used | |
| /data_01/delta_ellipsoid_tp_wgs84 | height difference between TOPEX and WGS84 reference ellipsoids | m |
| /data_01/depth_or_elevation | ocean depth or land elevation | m |
| /data_01/distance_to_coast | distance to the coast | m |
| /data_01/geoid | geoid height | m |
| /data_01/internal_tide | internal tide | m |
| /data_01/inv_bar_cor | inverse barometric height correction | m |
| /data_01/iono_cor_alt | altimeter ionospheric correction | m |
| /data_01/iono_cor_alt_filtered | altimeter smoothed ionospheric correction | m |
| /data_01/iono_cor_alt_filtered_nr | altimeter smoothed ionospheric correction from the numerical ocean retracker | m |
| /data_01/iono_cor_alt_nr | altimeter ionospheric correction from the numerical ocean retracker | m |
| /data_01/ku/atm_cor_sig0 | two-way atmospheric attenuation correction on altimeter backscatter coefficient | dB |
| /data_01/ku/index_first_20hz_measurement | Level 2 record counter of the first associated 20 Hz measurement | 1 |
| /data_01/ku/iono_cor_gim | GIM-derived ionospheric correction | m |
| /data_01/ku/model_instr_cor_range_ocean | modelled instrument correction on the altimeter range | m |
| /data_01/ku/model_instr_cor_range_ocean_nr | modelled instrument correction on the altimeter range from the numerical ocean retracker | m |
| /data_01/ku/model_instr_cor_sig0_ocean | modelled instrumental corrections on the backscatter coefficient | dB |
| /data_01/ku/model_instr_cor_sig0_ocean_nr | modelled instrumental corrections on the backscatter coefficient from the numerical ocean retracker | dB |
| /data_01/ku/model_instr_cor_swh_ocean | modelled instrumental corrections on the significant wave height | m |
| /data_01/ku/model_instr_cor_swh_ocean_nr | modelled instrumental corrections on the significant wave height from the numerical ocean retracker | m |
| /data_01/ku/net_instr_cor_range_ocean | net instrumental corrections on the altimeter range | m |
| /data_01/ku/net_instr_cor_range_ocean_nr | net instrumental corrections on the altimeter range from the numerical ocean retracker | m |
| /data_01/ku/net_instr_cor_sig0_ocean | net instrumental corrections on the backscatter coefficient | dB |
| /data_01/ku/net_instr_cor_sig0_ocean_nr | net instrumental corrections on the backscatter coefficient from the numerical ocean retracker | dB |
| /data_01/ku/net_instr_cor_swh_ocean | net instrumental corrections on the significant wave height | m |
| /data_01/ku/net_instr_cor_swh_ocean_nr | net instrumental corrections on the significant wave height from the numerical ocean retracker | m |
| /data_01/ku/numtotal_20hz_measurement | total number of 20 Hz measurements in 1 Hz time interval | 1 |
| /data_01/ku/ocean_geo_corrections | sum of meteo and geo corrections to be applied over ocean | m |
| /data_01/ku/ocean_geo_corrections_nr | sum of meteo and geo corrections to be applied over ocean for numerical retracking | m |
| /data_01/ku/rad_atm_cor_sig0_qual | quality flag for the radiometer two-way atmospheric correction to the backscatter coefficient | |
| /data_01/ku/range_cor_doppler | Doppler correction on the altimeter range computed with respect to the mean sea surface | m |
| /data_01/ku/range_ocean | corrected ocean altimeter range | m |
| /data_01/ku/range_ocean_nr | corrected ocean altimeter range from the numerical ocean retracker | m |
| /data_01/ku/range_ocean_nr_numval | number of valid points used to compute the ocean altimeter range from the numerical ocean retracker | 1 |
| /data_01/ku/range_ocean_nr_qual | quality flag for the ocean altimeter range from the numerical ocean retracker | |
| /data_01/ku/range_ocean_nr_rms | standard deviation of the ocean altimeter range from the numerical ocean retracker | m |
| /data_01/ku/range_ocean_numval | number of valid points used to compute the ocean altimeter range | 1 |
| /data_01/ku/range_ocean_qual | quality flag for the ocean altimeter range | |
| /data_01/ku/range_ocean_rms | standard deviation of the ocean altimeter range | m |
| /data_01/ku/sea_state_bias | sea state bias correction | m |
| /data_01/ku/sea_state_bias_nr | sea state bias correction from the numerical ocean retracker measurements | m |
| /data_01/ku/sig0_ocean | corrected ocean backscatter coefficient | dB |
| /data_01/ku/sig0_ocean_nr | corrected ocean backscatter coefficient from the numerical ocean retracker | dB |
| /data_01/ku/sig0_ocean_nr_numval | number of valid points used to compute the ocean backscatter coefficient from the numerical ocean retracker | 1 |
| /data_01/ku/sig0_ocean_nr_qual | quality flag for the ocean backscatter coefficient from the numerical ocean retracker | |
| /data_01/ku/sig0_ocean_nr_rms | standard deviation of the ocean backscatter coefficient from the numerical ocean retracker | dB |
| /data_01/ku/sig0_ocean_numval | number of valid points used to compute the ocean altimeter backscatter coefficient | 1 |
| /data_01/ku/sig0_ocean_qual | quality flag for the ocean backscatter coefficient | |
| /data_01/ku/sig0_ocean_rms | standard deviation of the ocean backscatter coefficient | dB |
| /data_01/ku/ssha | sea surface height anomaly | m |
| /data_01/ku/ssha_nr | sea surface height anomaly from the numerical ocean retracker | m |
| /data_01/ku/swh_ocean | corrected ocean significant wave height | m |
| /data_01/ku/swh_ocean_nr | corrected ocean significant wave height from the numerical ocean retracker | m |
| /data_01/ku/swh_ocean_nr_numval | number of valid points used to compute the ocean significant wave height from the numerical ocean retracker | 1 |
| /data_01/ku/swh_ocean_nr_qual | quality flag for the ocean significant wave height from the numerical ocean retracker | |
| /data_01/ku/swh_ocean_nr_rms | standard deviation of the ocean significant waveheight from the numerical ocean retracker | m |
| /data_01/ku/swh_ocean_numval | number of valid points used to compute the ocean significant wave height | 1 |
| /data_01/ku/swh_ocean_qual | quality flag for the ocean significant wave height | |
| /data_01/ku/swh_ocean_rms | standard deviation of the ocean significant waveheight | m |
| /data_01/l2_record_counter | Level 2 record counter | 1 |
| /data_01/latitude | latitude | degrees_north |
| /data_01/load_tide_sol1 | load tide height for geocentric ocean tide solution 1 (GOT4.10) | m |
| /data_01/load_tide_sol2 | load tide height for geocentric ocean tide solution 2 (FES2022b) | m |
| /data_01/longitude | longitude | degrees_east |
| /data_01/manoeuvre_flag | flag indicating whether the satellite is in a manoeuvre | |
| /data_01/mean_dynamic_topography | mean dynamic topography (Hybrid CNES-CLS22-CMEMS2020) above geoid | m |
| /data_01/mean_dynamic_topography_acc | mean dynamic topography accuracy | m |
| /data_01/mean_dynamic_topography_qual | mean dynamic topography interpolation flag | |
| /data_01/mean_sea_surface_sol1 | mean sea surface height solution 1 (Hybrid23 SIO/CNES-CLS/DTU) above the reference ellipsoid | m |
| /data_01/mean_sea_surface_sol1_acc | mean sea surface height (solution 1) accuracy | m |
| /data_01/mean_sea_surface_sol1_qual | mean sea surface solution 1 interpolation flag | |
| /data_01/mean_sea_surface_sol2 | mean sea surface height solution 2 (DTU21) above reference ellipsoid | m |
| /data_01/mean_sea_surface_sol2_acc | mean sea surface height (solution 2) accuracy | m |
| /data_01/mean_sea_surface_sol2_qual | mean sea surface solution 2 interpolation flag | |
| /data_01/mean_swell_wave_direction_from | mean swell wave from direction from MFWAM | degrees |
| /data_01/mean_swell_wave_period | spectral moments (1,0) swell wave period from MFWAM | s |
| /data_01/mean_wave_direction_from | mean wave from direction (Mdir) from MFWAM | degrees |
| /data_01/mean_wave_period_t02 | spectral moments (0,2) wave period (Tm02) from MFWAM | s |
| /data_01/meteo_map_availability_flag | flag indicating the meteo maps availability | |
| /data_01/model_dry_tropo_cor_measurement_altitude | model dry tropospheric correction at measurement altitude | m |
| /data_01/model_dry_tropo_cor_zero_altitude | model dry tropospheric correction at zero altitude | m |
| /data_01/model_wet_tropo_cor_measurement_altitude | model wet tropospheric correction at measurement altitude | m |
| /data_01/model_wet_tropo_cor_zero_altitude | model wet tropospheric correction at zero altitude | m |
| /data_01/ocean_tide_eq | equilibrium long-period ocean tide height | m |
| /data_01/ocean_tide_non_eq | non-equilibrium long-period geocentric ocean tide height | m |
| /data_01/ocean_tide_sol1 | geocentric ocean tide height solution 1 (GOT4.10) | m |
| /data_01/ocean_tide_sol1_qual | ocean tide solution 1 (GOT) interpolation flag | |
| /data_01/ocean_tide_sol2 | geocentric ocean tide height solution 2 (FES2022b) | m |
| /data_01/ocean_tide_sol2_qual | ocean tide solution 2 (FES) interpolation flag | |
| /data_01/off_nadir_pitch_angle_pf | off-nadir pitch angle measured by the platform | degrees |
| /data_01/off_nadir_roll_angle_pf | off-nadir roll angle measured by the platform | degrees |
| /data_01/off_nadir_yaw_angle_pf | off-nadir yaw angle measured by the platform | degrees |
| /data_01/orbit_type_flag | orbit type used | |
| /data_01/pass_direction_flag | flag indicating whether pass is ascending or descending | |
| /data_01/pole_tide | sea surface height amplitude due to the pole tide | m |
| /data_01/rad_cloud_liquid_water | radiometer liquid water content | kg/m^2 |
| /data_01/rad_cloud_liquid_water_qual | quality flag for the radiometer cloud liquid water content | |
| /data_01/rad_rain_flag | radiometer rain flag | |
| /data_01/rad_sea_ice_flag | radiometer sea ice flag | |
| /data_01/rad_state_oper_flag | operating mode of the radiometer | |
| /data_01/rad_surface_type_flag | radiometer surface type | |
| /data_01/rad_tb_187 | radiometer equalized brightness temperature at 18.7 GHz | K |
| /data_01/rad_tb_187_qual | quality flag for the 18.7 GHz equalized brightness temperature | |
| /data_01/rad_tb_238 | radiometer equalized brightness temperature at 23.8 GHz | K |
| /data_01/rad_tb_238_qual | quality flag for the 23.8 GHz equalized brightness temperature | |
| /data_01/rad_tb_340 | radiometer equalized brightness temperature at 34.0 GHz | K |
| /data_01/rad_tb_340_qual | quality flag for the 34.0 GHz equalized brightness temperature | |
| /data_01/rad_water_vapor | radiometer water vapor content | kg/m^2 |
| /data_01/rad_water_vapor_qual | quality flag for the radiometer water vapor content | |
| /data_01/rad_wet_tropo_cor | radiometer wet tropospheric correction | m |
| /data_01/rad_wet_tropo_cor_qual | quality flag for the radiometer wet troposphere correction | |
| /data_01/rad_wind_speed | radiometer wind speed | m/s |
| /data_01/rad_wind_speed_qual | quality flag for the radiometer wind speed | |
| /data_01/rain_attenuation | rain attenuation for Ku-band | dB |
| /data_01/rain_attenuation_nr | rain attenuation for Ku-band (numerical ocean retracker) | dB |
| /data_01/rain_flag | altimeter rain flag | |
| /data_01/rain_flag_nr | altimeter rain flag from the numerical ocean retracker | |
| /data_01/significant_swell_wave_height | modelled spectral significant swell wave height from MFWAM | m |
| /data_01/significant_wave_height | modelled spectral significant wave height (Hm0) from MFWAM | m |
| /data_01/solid_earth_tide | solid earth tide height | m |
| /data_01/surface_classification_flag | surface type classification | |
| /data_01/time | time in UTC | seconds since 2000-01-01 00:00:00.0 |
| /data_01/time_tai | time in TAI | seconds since 2000-01-01 00:00:00.0 |
| /data_01/total_electron_content | total electron content | m^-2 |
| /data_01/wave_model_interp_qual | wave model interpolation flag | |
| /data_01/wind_speed_alt | altimeter wind speed | m/s |
| /data_01/wind_speed_alt_nr | altimeter wind speed from the numerical ocean retracker measurements | m/s |
| /data_01/wind_speed_mod_u | U component of the model wind vector at the altimeter time tag | m/s |
| /data_01/wind_speed_mod_v | V component of the model wind vector at the altimeter time tag | m/s |
| DATA CITATION GUIDELINES | |
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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 | Ocean Surface Topography Science Team. 2026. Sentinel-6B/Jason-CS L2 P4 Altimeter High Resolution (HR) NRT Reduced Ocean Surface Topography . Ver. G. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/S6BP4-2HRNR
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Donlon, C. J, R. Cullen, L. Giulicchi, P. Vuilleumier, C. R. Francis, M. Kuschnerus, W. Simpson, A. Bouridah, M. Caleno, R. Bertoni, J. Rancaño, E. Pourier, A. Hyslop, J. Mulcahy, R. Knockaert, C. Hunter, A. Webb, M. Fornari, P. Vaze, S. Brown, J. Willis, S. Desai, J-D Desjonqueres, R. Scharroo, C. Martin-Puig, E. Leuliette, A. Egido, W. H. F. Smith, P. B., S. Le Gac, N. Picot, and G. Tavernier. 2021. The Copernicus Sentinel-6 mission: Enhanced continuity of satellite sea level measurements from space, Remote Sensing of Environment, 258. 10.1016/j.rse.2021.112395 |
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