N: 66.15 S: -66.15 E: 180 W: -180
Description
Provides L2P high resolution (HR) non-time critical (NTC; 60-day latency) altimetry from the Poseidon-4 SAR altimeter on the Sentinel-6A Michael Freilich spacecraft, and contains L2-equivalent geophysical sea-state data at a slightly different latency than the other L2 NRT products. The sea-state data were derived from L1B altimetry, and include range, orbital altitude, time, and water vapour. Environmental and geophysical corrections, significant wave height, and wind-speed information are supplied by the AMR-C. The S6A NTC product is analogous to the Jason-3 GDR product.
Product Summary
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
Copy Citation
Documents
GENERAL DOCUMENTATION
DATA CITATION GUIDELINES
Get Help
QUESTIONS & SUPPORT
Get help with NASA Earth science data, datasets, tools, services, and metadata on the Earthdata Forum. Experienced staff in the data user community review and answer questions.
Get help on Earthdata ForumForum
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 |
|---|---|---|---|---|---|---|---|
| altitude | Altitude of satellite above the reference ellipsoid (WGS84). | m | int | 2147483647 | N/A | 0.0001 | 1300000 |
| dry_tropospheric_correction_model | Computed at the altimeter time-tag from the interpolation of 2 meteorological fields (use of mean sea level pressure) 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. | m | short | 32767 | N/A | 0.0001 | N/A |
| dynamic_atmospheric_correction | Based on MOG2D high resolution model forced with operational ECMWF pressure and wind speed fields. This correction is computed by adding the high frequency fluctuations of the sea surface topography computed by MOG2D and the low-frequency of the inverted barometer effect computed from MSL ECMWF pressure. The cut-period between high/low frequencies is 20 days. | m | short | 32767 | N/A | 0.0001 | N/A |
| internal_tide | Version of the model is HRET_v8.1. The following tidal frequencies are included: M2, K1, O1, S2 | m | short | 32767 | N/A | 0.0001 | N/A |
| inter_mission_bias | bias to have consistent time series since TOPEX/Poseidon | m | int | 2147483647 | N/A | 0.0001 | N/A |
| ionospheric_correction | 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. | m | short | 32767 | N/A | 0.0001 | N/A |
| latitude | latitude | degrees_north | int | N/A | N/A | 1.0E-6 | N/A |
| longitude | longitude | degrees_east | int | N/A | N/A | 1.0E-6 | N/A |
| mean_sea_surface | Combined SIO/CNES-CLS-15/DTU15 mean sea surface (referenced to 20 year period). | m | int | 2147483647 | N/A | 0.0001 | N/A |
| ocean_tide_height | Includes high frequency and long period ocean tide height and the corresponding loading tide height. | m | int | 2147483647 | N/A | 0.0001 | N/A |
| pole_tide | Update of the model for rotational deformation and update of the linear mean pole model based on the 2017 reference. | m | short | 32767 | N/A | 0.0001 | N/A |
| range | All instrumental corrections included, i.e. distance antenna-COG, USO drift correction, internal path correction, Doppler correction, modeled instrumental errors corrections and system bias. | m | int | 2147483647 | N/A | 0.0001 | 1300000 |
| sea_level_anomaly | altitude of satellite (altitude) - ocean altimeter range (range) - ionospheric correction (ionospheric_correction) - dry tropospheric correction (dry_tropospheric_correction_model) - wet tropospheric correction (wet_tropospheric_correction) - sea state bias correction (sea_state_bias) - solid earth tide height (solid_earth_tide) - geocentric ocean tide height (ocean_tide_height) - geocentric pole tide height (pole_tide) - dynamic atmospheric correction (dynamic_atmospheric_correction) - internal tide height (internal_tide) - mean sea surface (mean_sea_surface) - inter mission bias (inter_mission_bias) | m | short | 32767 | N/A | 0.0001 | N/A |
| 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. | m | short | 32767 | N/A | 0.0001 | N/A |
| solid_earth_tide | Calculated using Cartwright and Tayler tables and consisting of the second and third degree constituents. The permanent tide (zero frequency) is not included. | m | short | 32767 | N/A | 0.0001 | N/A |
| time | time (sec. since 2000-01-01) | seconds since 2000-01-01 00:00:00.0 | double | N/A | N/A | 1 | N/A |
| validation_flag | validation flag | N/A | byte | 127 | N/A | 1 | N/A |
| wet_tropospheric_correction | 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 . This correction is computed from the data of the onboard radiometer. | m | short | 32767 | N/A | 0.0001 | N/A |
| wet_tropospheric_correction_model | Computed 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. | m | short | 32767 | N/A | 0.0001 | N/A |