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
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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/iono_cor_alt | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_alt_adaptive | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_alt_filtered | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_alt_filtered_adaptive | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_alt_filtered_adaptive_qual | filtered altimeter ionospheric correction quality flag (adaptive retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/iono_cor_alt_filtered_mle3 | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_alt_filtered_mle3_qual | filtered altimeter ionospheric correction quality flag (MLE3 retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/iono_cor_alt_filtered_qual | filtered altimeter ionospheric correction quality flag | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/iono_cor_alt_mle3 | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/iono_cor_gim | An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See SWOT Nadir Altimeter User Handbook | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean | square of the off nadir angle computed from Ku band waveforms | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_compression_qual | quality flag for 1 Hz altimeter data: off nadir angle from Ku band | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_numval | number of valid points for square of the off nadir angle computed from Ku band waveforms | count | byte | 127 | 0 to 20 | 1 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_rms | Compression of high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/range_adaptive | 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) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_01/ku/range_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band range (adaptive retracking) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_adaptive_numval | number of valid points for Ku band range (adaptive retracking) | count | byte | 127 | 0 to 20 | 1 | N/A |
| /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_doppler | Ku band Doppler correction on altimeter range | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/range_cor_internal_path | Internal calibration correction on the Ku band altimeter range | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/range_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on altimeter range (MLE3 retracking) | m | short | 32767 | 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_model_instr | Ku band modeled instrumental correction on altimeter range | m | short | 32767 | 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_calibration | Ku band internal calibration correction on backscatter coefficient | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on backscatter coefficient (MLE3 retracking) | 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_model_instr | Ku band modeled instrumental correction on backscatter coefficient | 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 |