N: 77.6 S: -77.6 E: 180 W: -180
Description
Same as L2_NALT_GDR using predicted values for some auxiliary data, and does not have GIM ionosphere model values. Uses the onboard DORIS orbit ephemeris. Available with latency of < 7 hours. Discrete measurements at nadir for each data downlink, 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_OGDR_D
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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/range_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 | 0.0001 | N/A |
| /data_01/ku/range_cor_adaptive_net_instr | Sum of distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler) and system bias | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/range_cor_ocean_mle3_net_instr | Sum of distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler), modeled instrumental errors correction (range_cor_ocean_mle3_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/range_cor_ocean_net_instr | Sum of distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler), modeled instrumental errors correction (range_cor_ocean_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/range_cor_ocean_net_instr_qual | Threshold control of range_cor_ocean_net_instr | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean | All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler), modeled instrumental errors correction (range_cor_ocean_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_01/ku/range_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band range | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_mle3 | All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler), modeled instrumental errors correction (range_cor_ocean_mle3_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_01/ku/range_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band range (MLE3 retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_mle3_numval | number of valid points for Ku band range (MLE3 retracking) | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/range_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 | 0.0001 | N/A |
| /data_01/ku/range_ocean_numval | number of valid points for Ku band range | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/range_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 | 0.0001 | N/A |
| /data_01/ku/sea_state_bias | A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. This element should not be used over land. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias_3d_mp2 | Sea state bias computed from 3D model with mean wave period (T02) as third input. A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. This element should not be used over land. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias_adaptive | A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. This element should not be used over land. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias_adaptive_3d_mp2 | Sea state bias computed from 3D model with mean wave period (T02) as third input. A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. This element should not be used over land. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias_mle3 | A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. This element should not be used over land. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sig0_adaptive | All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm) | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient (adaptive retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_adaptive_numval | number of valid points used to compute Ku band backscatter coefficient (adaptive retracking) | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/sig0_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 | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_cor_adaptive_net_instr | Sum of AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) - system bias not included | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_cor_atm | Based either on the radiometer (if available) or atmospheric model (otherwise). The flag sig0_cor_atm_source indicates whether the atmospheric model has been used | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_cor_ocean_mle3_net_instr | Sum of AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) and modeled instrumental errors correction (sig0_cor_ocean_mle3_model_instr) - system bias not included | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_cor_ocean_net_instr | Sum of AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) and modeled instrumental errors correction (sig0_cor_ocean_model_instr) - system bias not included | dB | short | 32767 | N/A | 0.01 | N/A |
| /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_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_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 |