N: 66.15 S: -66.15 E: 180 W: -180
Description
Provides low resolution (LR) near real time (NRT; 3-hour latency) measurements of sea surface height anomaly (SSHA), Significant Wave Height (SWH), and Wind Speed, along with 1 Hz and 20 Hz measurements from the radar altimeter, orbit altitude, environmental range corrections, instrument corrections, and geophysical models. The NRT product is analogous to the Jason-3 OGDR product.
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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/model_instr_cor_swh_ocean_mle3 | Modelled instrumental correction on the significant wave height from MLE3, extracted from look-up tables. The correction is computed at 1-Hz then applied to 20-Hz estimates. | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/net_instr_cor_off_nadir_angle_wf_ocean | Sum of all Instrumental corrections on the squared off nadir angle: modeled instrumental errors correction and system bias | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/net_instr_cor_range_ocean | Sum of all Instrumental corrections on the altimeter range: USO drift (L1B range_cor_uso) + internal path delay (L1B range_cor_internal_delay_cal and range_cor_internal_delay_diff) + external path delay (L1B range_cor_external_group_delay) + distance antenna-COG (L1B range_cor_com) + Doppler correction (L2 range_cor_doppler) + modeled instrumental errors correction (L2 model_instr_cor_range_ocean) + system bias | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/net_instr_cor_range_ocean_mle3 | Sum of all Instrumental corrections on the altimeter range from MLE3: USO drift (L1B range_cor_uso) + internal path delay (L1B range_cor_internal_delay_cal and range_cor_internal_delay_diff) + external path delay (L1B range_cor_external_group_delay) + distance antenna-COG (L1B range_cor_com) + Doppler correction (L2 range_cor_doppler) + modeled instrumental errors correction (L2 model_instr_cor_range_ocean_mle3) + system bias | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/net_instr_cor_sig0_ocean | Sum of all Instrumental corrections on the backscatter coefficient: all calibrated instrument gains (L1B power_scaling_to_antenna) + modeled instrumental errors correction (L2 model_instr_cor_sig0_ocean) + system bias. The atmospheric attenuation correction is not included. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/net_instr_cor_sig0_ocean_mle3 | Sum of all Instrumental corrections on the backscatter coefficient from MLE3: all calibrated instrument gains (L1B power_scaling_to_antenna) + modeled instrumental errors correction (L2 model_instr_cor_sig0_ocean_mle3) + system bias. The atmospheric attenuation correction is not included. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/net_instr_cor_swh_ocean | Sum of all Instrumental corrections on the significant wave height: modeled instrumental errors correction and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/net_instr_cor_swh_ocean_mle3 | Sum of all Instrumental corrections on the significant wave height from MLE3: modeled instrumental errors correction and system bias | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/numtotal_20hz_measurement | Total number of 20 Hz measurements in the 1 Hz time interval [time-0.5s, time+0.5s) | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/ocean_geo_corrections | Sum of meteorological and geophysical corrections to be applied to SSHA over ocean: altimeter ionospheric correction (iono_cor_alt_filtered) + model dry tropospheric correction at zero altitude (model_dry_tropo_cor_zero_altitude) + radiometer wet tropospheric correction (rad_wet_tropo) + sea state bias correction (sea_state_bias) + solid earth tide height (solid_earth_tide) + geocentric ocean tide height solution 2 (FES) (ocean_tide_sol2) + internal tide (internal_tide) + geocentric pole tide height (pole_tide) + dynamic atmospheric correction (dac for NTC/STC off line products, inv_bar_cor for NRT products) | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/ocean_geo_corrections_mle3 | Sum of meteorological and geophysical corrections to be applied to SSHA from MLE3 over ocean: altimeter ionospheric correction (iono_cor_alt_filtered_mle3) + model dry tropospheric correction at zero altitude (model_dry_tropo_cor_zero_altitude) + radiometer wet tropospheric correction (rad_wet_tropo) + sea state bias correction (sea_state_bias_mle3) + solid earth tide height (solid_earth_tide) + geocentric ocean tide height solution 2 (FES) (ocean_tide_sol2) + internal tide (internal_tide) + geocentric pole tide height (pole_tide) + dynamic atmospheric correction (dac for NTC/STC off line products, inv_bar_cor for NRT products) | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean | Square of the off-nadir mispointing angle, computed from MLE4 retracking. It includes instrumental correction from model_instr_cor_off_nadir_angle_wf_ocean | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_qual | Validity flag indicating 'good' or 'bad' estimate of the off-nadir angle derived from the waveform ocean retracking | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/off_nadir_angle_wf_ocean_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | degrees^2 | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/rad_atm_cor_sig0_qual | Quality flag for the radiometer two-way atmospheric correction to the operational band backscatter coefficient | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_cor_doppler | Doppler correction computed with respect to the mean sea surface / geoid. It is applied to the altimeter range | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/range_ocean | Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean | m | int | 2147483647 | N/A | 0.0001 | 1300000 |
| /data_01/ku/range_ocean_mle3 | Range computed from the MLE3 ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean_mle3 | m | int | 2147483647 | N/A | 0.0001 | 1300000 |
| /data_01/ku/range_ocean_mle3_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_mle3_qual | Flag indicating the use or not of the 20 Hz ocean altimeter range estimate in the computation of the 1 Hz estimate (map of compression) | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_mle3_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/range_ocean_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_qual | Validity flag indicating 'good' or 'bad' measurement of the ocean altimeter range | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/range_ocean_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias | Sea state bias correction derived for: LR Ku-band, LR C-band and HR Ku-band. A sea state bias correction must be added (negative value) to the instrument range measurement to correct it for sea state bias delays of the radar pulse | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sea_state_bias_mle3 | Sea state bias correction derived for: LR Ku-band (MLE3 retracking). A sea state bias correction must be added (negative value) to the instrument range measurement to correct it for sea state bias delays of the radar pulse | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/ku/sig0_ocean | Backscatter coefficient computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_sig0_ocean and sig0_scaling_factor as well as the atmospheric attenuation correction. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_mle3 | Backscatter coefficient computed from the MLE3 ocean retracker. It includes all instrumental corrections from net_instr_cor_sig0_ocean and sig0_scaling_factor as well as the atmospheric attenuation correction. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_mle3_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_mle3_qual | Validity flag indicating 'good' or 'bad' ocean backscatter coefficient measurement | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_mle3_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/sig0_ocean_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_qual | Validity flag indicating 'good' or 'bad' ocean backscatter coefficient measurement | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/sig0_ocean_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | dB | short | 32767 | N/A | 0.01 | N/A |
| /data_01/ku/ssha | Sea surface height anomaly = altitude of satellite (altitude) - Ku band corrected ocean altimeter range (range_ocean) - geo corrections (ocean_geo_corrections) - mean sea surface (mean_sea_surface_sol1) | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/ssha_mle3 | Sea surface height anomaly from MLE3 = altitude of satellite (altitude) - Ku band corrected ocean altimeter range from MLE3 (range_ocean_mle3) - geo corrections from MLE3 (ocean_geo_corrections_mle3) - mean sea surface (mean_sea_surface_sol1) | m | int | 2147483647 | N/A | 0.0001 | N/A |
| /data_01/ku/swh_ocean | SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_mle3 | SWH computed from the MLE3 ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_mle3_numval | Number of 20Hz valid measurements used to compute the 1Hz measurement | count | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_mle3_qual | Validity flag indicating 'good' or 'bad' ocean significant wave height measurement | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_mle3_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/ku/swh_ocean_numval | Number of valid 20 Hz measurements used to compute the 1 Hz measurement | 1 | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_qual | Validity flag indicating 'good' or 'bad' ocean significant wave height measurement | N/A | byte | 127 | N/A | 1 | N/A |
| /data_01/ku/swh_ocean_rms | Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement. | m | short | 32767 | N/A | 0.001 | N/A |
| /data_01/l2_record_counter | This is the Level 2 record counter. Starting from 0 for each Level 2 product | 1 | int | 2147483647 | N/A | 1 | N/A |
| /data_01/latitude | Latitude of measurement [-90, +90]. Positive latitude is North latitude, negative latitude is South latitude | degrees_north | int | 2147483647 | N/A | 1.0E-6 | N/A |
| /data_01/load_tide_sol1 | This value has already been added to the corresponding ocean tide height value recorded in the product (ocean_tide_sol1) | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/load_tide_sol2 | This value contains the total load tide height (short-period and long-period) for the geocentric ocean tide (solution 2). To get only the pure ocean tide height (solution 2), do: ocean_tide_sol2 + ocean_tide_non_eq - load_tide_sol2. This value has already been added to the corresponding ocean tide height value recorded in the product (ocean_tide_sol2) | m | short | 32767 | N/A | 0.0001 | N/A |
| /data_01/longitude | Longitude of measurement [0, 360). East longitude relative to Greenwich meridian | degrees_east | int | 2147483647 | N/A | 1.0E-6 | N/A |