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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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_20/ku/agc | AGC is corrected for instrumental errors due to the imperfections of the on-board attenuators | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_20/ku/agc_cor | Comes from AGC static characterization, and added to on-board AGC to obtain applied AGC | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_20/ku/amplitude_adaptive | Ku band amplitude (adaptive retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_ice2 | Ku band amplitude (ice-2 retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_ocean | Ku band amplitude (ocean retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_ocean_mle3 | Ku band amplitude (MLE3 retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_ocog | Ku band amplitude (OCOG retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_seaice | Ku band amplitude (sea-ice retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/amplitude_tfmra | Ku band amplitude (TFMRA retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/convergence_criteria_adaptive | Ku band convergence criteria (adaptive retracking) | count | int | 2147483647 | N/A | 0.01 | N/A |
| /data_20/ku/epoch_adaptive | Ku band epoch (adaptive retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_ice2 | Ku band epoch (ice-2 retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_ocean | Ku band epoch (ocean retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_ocean_mle3 | Ku band epoch (MLE3 retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_ocog | Ku band epoch (OCOG retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_seaice | Ku band epoch (sea-ice retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/epoch_tfmra | Ku band epoch (TFMRA retracking) | s | int | 2147483647 | N/A | 1.0E-15 | N/A |
| /data_20/ku/gamma_adaptive | Ku band gamma (adaptive retracking) | count | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_20/ku/ice2_qual | ice-2 retracking quality flag | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/mean_amplitude_ice2 | Ku band mean amplitude (ice-2 retracking) [FFT power unit] | count | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_20/ku/mqe_adaptive | Mean Quadratic Error between the waveforms samples and the corresponding model samples built from the adaptive retracking outputs | 1 | short | 32767 | N/A | 0.0001 | N/A |
| /data_20/ku/mqe_ice2 | Mean Quadratic Error between the waveforms samples and the corresponding model samples built from the ice-2 retracking outputs | 1 | int | 2147483647 | N/A | 1.0E-5 | N/A |
| /data_20/ku/mqe_ocean | Mean Quadratic Error between the waveforms samples and the corresponding model samples built from the ocean retracking outputs | 1 | short | 32767 | N/A | 0.0001 | N/A |
| /data_20/ku/mqe_ocean_mle3 | Mean Quadratic Error between the waveforms samples and the corresponding model samples built from the MLE3 retracking outputs | 1 | short | 32767 | N/A | 0.0001 | N/A |
| /data_20/ku/noise_floor_adaptive | Ku band thermal noise (adaptive retracking) [FFT power unit] | count | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_20/ku/noise_floor_ice2 | Ku band thermal noise (ice-2 retracking) [FFT power unit] | count | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_20/ku/noise_floor_ocean | Ku band thermal noise (ocean retracking) [FFT power unit] | count | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_20/ku/num_iterations_adaptive | 20 Hz number of iterations of the adaptive retracking in Ku band | count | short | 32767 | N/A | 1 | N/A |
| /data_20/ku/num_iterations_ocean | 20 Hz number of iterations of the ocean retracking in Ku band | count | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/num_iterations_ocean_mle3 | 20 Hz number of iterations of the ocean retracking in Ku band (MLE3 retracking) | count | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/ocog_qual | OCOG retracking quality flag | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/off_nadir_angle_wf_ocean | 20 Hz square of the off nadir angle computed from Ku band waveforms | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_20/ku/off_nadir_angle_wf_ocean_compression_qual | Map of valid points used to compute the 1 Hz square of the off nadir angle computed from Ku band waveforms | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/peakiness | 20 Hz peakiness on Ku band waveforms | 1 | int | 2147483647 | N/A | 0.001 | N/A |
| /data_20/ku/power_waveform | Waveforms are corrected for the Low Pass Filter effects | count | int | 2147483647 | N/A | 0.001 | N/A |
| /data_20/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 (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/range_adaptive_compression_qual | Map of valid points used to compute the 1 Hz Ku band altimeter range | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/range_ice2 | Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/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 (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler), modeled instrumental errors correction (/data_01/ku/range_cor_ocean_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/range_ocean_compression_qual | Map of valid points used to compute the 1 Hz Ku band altimeter range | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/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 (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler), modeled instrumental errors correction (/data_01/ku/range_cor_ocean_mle3_model_instr) and system bias | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/range_ocean_mle3_compression_qual | Map of valid points used to compute the 1 Hz Ku band altimeter range | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/range_ocog | Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/range_seaice | Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/range_tfmra | Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included | m | int | 2147483647 | N/A | 0.0001 | 800000 |
| /data_20/ku/seaice_qual | sea-ice retracking quality flag | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/sig0_adaptive | All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (/data_01/ku/sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm) | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_20/ku/sig0_adaptive_compression_qual | Map of valid points used to compute the 1 Hz Ku band backscatter coefficient | N/A | byte | 127 | N/A | 1 | N/A |
| /data_20/ku/sig0_ice2 | AGC instrumental errors correction and internal calibration correction (/data_01/ku/sig0_cor_calibration) included | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_20/ku/sig0_leading_edge_ice2 | AGC instrumental errors correction and internal calibration correction (/data_01/ku/sig0_cor_calibration) included | dB | short | 32767 | N/A | 0.01 | N/A |