N: 77.6 S: -77.6 E: 180 W: -180
Description
Same as L2_NALT_GDR, using preliminary values for some auxiliary data. Uses Medium-accuracy (preliminary) Orbit Ephemeris (MOE). Available with latency of < 1.5 days. Discrete measurements at nadir for each half orbit, along the ground track. Available in netCDF-4 file format.
This collection is a sub-collection of its parent: https://podaac.jpl.nasa.gov/dataset/SWOT_L2_NALT_IGDR_D
Product Summary
Citation
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Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor | Offset |
|---|---|---|---|---|---|---|---|
| /data_01/ku/sig0_cor_ocean_net_instr_qual | Threshold control of sig0_cor_ocean_net_instr | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean | All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration), modeled instrumental errors correction (sig0_cor_ocean_model_instr) and atmospheric attenuation (sig0_cor_atm) | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_mle3 | All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration), modeled instrumental errors correction (sig0_cor_ocean_mle3_model_instr) and atmospheric attenuation (sig0_cor_atm) | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient (MLE3 retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_mle3_numval | number of valid points used to compute Ku band backscatter coefficient (MLE3 retracking) | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/sig0_ocean_mle3_rms | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_numval | number of valid points used to compute Ku band backscatter coefficient | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/sig0_ocean_rms | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/ssha | = altitude of satellite (/data_01/altitude) - Ku band corrected altimeter range (range_ocean) - filtered altimeter ionospheric correction on Ku band (iono_cor_alt_filtered) - model dry tropospheric correction (/data_01/model_dry_tropo_cor_zero_altitude) - radiometer wet tropospheric correction (/data_01/rad_wet_tropo_cor) - sea state bias correction in Ku band (sea_state_bias) - solid earth tide height (/data_01/solid_earth_tide) - geocentric ocean tide height from FES solution (/data_01/ocean_tide_fes) - non-equilibrium long-period ocean tide height (/data_01/ocean_tide_non_eq) - geocentric pole tide height (/data_01/pole_tide) - internal tide (/data_01/internal_tide_hret) - dynamic atmospheric correction (/data_01/dac) - mean sea surface from CNES/CLS solution (/data_01/mean_sea_surface_cnescls). Set to default if the waveform classification (wvf_main_class) is not set to 1 = brown ocean, 12 = shifted brown, 13 = brown noise leading edge or 15 = linear positive_slope, or if the radiometer wet tropospheric interpolation quality flag (/data_01/rad_wet_tropo_cor_interp_qual) is set to 2 = fail | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/ssha_mle3 | = altitude of satellite (/data_01/altitude) - Ku band corrected altimeter range (range_ocean_mle3) - filtered altimeter ionospheric correction on Ku band (iono_cor_alt_filtered_mle3) - model dry tropospheric correction (/data_01/model_dry_tropo_cor_zero_altitude) - radiometer wet tropospheric correction (/data_01/rad_wet_tropo_cor) - sea state bias correction in Ku band (sea_state_bias_mle3) - solid earth tide height (/data_01/solid_earth_tide) - geocentric ocean tide height from FES solution (/data_01/ocean_tide_fes) - non-equilibrium long-period ocean tide height (/data_01/ocean_tide_non_eq) - geocentric pole tide height (/data_01/pole_tide) - internal tide (/data_01/internal_tide_hret) - dynamic atmospheric correction (/data_01/dac) - mean sea surface from CNES/CLS solution (/data_01/mean_sea_surface_cnescls). Set to default if the waveform classification (wvf_main_class) is not set to 1 = brown ocean, 12 = shifted brown, 13 = brown noise leading edge or 15 = linear positive_slope, or if the radiometer wet tropospheric interpolation quality flag (/data_01/rad_wet_tropo_cor_interp_qual) is set to 2 = fail | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_adaptive | Ku band corrected significant waveheight (adaptive retracking) | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH (adaptive retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_adaptive_numval | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/swh_adaptive_rms | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_adaptive_net_instr | Set to zero | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on significant waveheight (MLE3 retracking) | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_ocean_mle3_net_instr | Sum of modeled instrumental errors correction (swh_cor_ocean_mle3_model_instr) and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_ocean_model_instr | Ku band modeled instrumental correction on significant waveheight | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_ocean_net_instr | Sum of modeled instrumental errors correction (swh_cor_ocean_model_instr) and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_cor_ocean_net_instr_qual | Threshold control of swh_cor_ocean_net_instr | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean | All instrumental corrections included, i.e. modeled instrumental errors correction (swh_cor_ocean_model_instr) and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_mle3 | All instrumental corrections included, i.e. modeled instrumental errors correction (swh_cor_ocean_mle3_model_instr) and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH (MLE3 retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_mle3_numval | number of valid points used to compute Ku band significant waveheight (MLE3 retracking) | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/swh_ocean_mle3_rms | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_numval | number of valid points used to compute Ku band significant waveheight | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/swh_ocean_rms | Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/wvf_main_class | Waveform classification : main class selected by classification neural network trained on shape features of the waveforms | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/latitude | Positive latitude is North latitude, negative latitude is South latitude. See SWOT Nadir Altimeter User Handbook. Associated quality flag is orb_state_diode_flag for the OGDR products, orb_state_rest_flag for the IGDR and GDR products | degrees_north | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_01/load_tide_fes | This value contains the total load tide height (short-period and long-period) for the geocentric ocean tide (FES solution). To get only the ocean tide height (FES solution), do: ocean_tide_fes + ocean_tide_non_eq - load_tide_fes. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/load_tide_got | This value has already been added to the corresponding ocean tide height value recorded in the product (ocean_tide_got). See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/longitude | East longitude relative to Greenwich meridian. See SWOT Nadir Altimeter User Handbook. Associated quality flag is orb_state_diode_flag for the OGDR products, orb_state_rest_flag for the IGDR and GDR products | degrees_east | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_01/mean_dynamic_topography | See SWOT Nadir Altimeter User Handbook | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/mean_dynamic_topography_interp_qual | MDT interpolation flag | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/mean_sea_surface_cnescls | See SWOT Nadir Altimeter User Handbook | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/mean_sea_surface_cnescls_interp_qual | mean sea surface interpolation flag (CNES/CLS solution) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/mean_sea_surface_dtu | See SWOT Nadir Altimeter User Handbook | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/mean_sea_surface_dtu_interp_qual | mean sea surface interpolation flag (DTU solution) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/mean_wave_direction | mean direction of the sea surface wave | degrees | int | 2147483647 | N/A | 0.01 | N/A |
| /data_01/mean_wave_period_t02 | t02 mean wave period | s | short | 32767 | N/A | 0.01 | N/A |
| /data_01/meteo_map_availability_flag | Possible values are: 0 meaning ’2 maps, nominal’ (six hours apart), 1 meaning ’2 maps, degraded’ (more than six hours apart), 2 meaning ’1 map, closest map used’, 3 meaning ’no valid map’ | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/meteo_measurement_altitude_interp_qual | 0 = interpolation from 4 points; 1 = interpolation from less than 4 points | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/meteo_zero_altitude_interp_qual | 0 = interpolation from 4 points; 1 = interpolation from less than 4 points | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/model_dry_tropo_cor_measurement_altitude | Computed at coarse DEM altitude (for O&IGDR) or precise measurement altitude (for GDR) at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A dry tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for dry tropospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/model_dry_tropo_cor_zero_altitude | Computed at Mean Sea Level Pressure at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A dry tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for dry tropospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/model_wet_tropo_cor_measurement_altitude | Computed at coarse DEM altitude (for O&IGDR) or precise measurement altitude (for GDR) at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A wet tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for wet tropospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/model_wet_tropo_cor_zero_altitude | Computed at coarse DEM altitude at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A wet tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for wet tropospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/numtotal_20hz_measurement | Total number of 20 Hz measurements associated to the 1 Hz measurement | N/A | byte | 127 | N/A | 1 | N/A |