Sentinel-6A MF: Ocean Surface Topography from P4 Altimeter

Sentinel-6A Michael Freilich's Poseidon-4 SAR altimeter provides low-resolution, non-time-critical sea surface topography data with a 60-day latency. This L2P product includes derived geophysical sea-state variables like significant wave height and wind speed, processed with environmental corrections from the AMR-C instrument. Its data structure is analogous to the Jason-3 GDR product, offering continuity for long-term ocean climate records.

Use Cases

• Monitoring long-term sea-level rise trends based on precise altimeter range and orbital altitude measurements.
• Analyzing ocean wave climate and storm impacts using the significant wave height and wind speed parameters.
• Correcting satellite altimetry signals for atmospheric delays using the included water vapor and environmental correction data.
• Calibrating and validating ocean circulation and wave models with the non-time-critical, quality-controlled geophysical dataset.

Strengths

• Data is produced by NASA, indicating a high level of institutional authority and calibration rigor.
• The product is explicitly described as analogous to the Jason-3 GDR product, suggesting a mature and standardized processing lineage.
• Its presence on multiple official data platforms (Data.gov, NASA Earthdata) signals its importance and reliability for the scientific community.

Limitations

• Critical metadata such as row count, file size, and specific column names are unavailable across all sources, hindering precise data assessment.
• The dataset has a significant 60-day latency (NTC), making it unsuitable for near-real-time monitoring or forecasting applications.
• License information is ambiguously listed as 'other-license-specified' without details, requiring users to investigate terms of use.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Derived from L1B altimetry data collected by the Poseidon-4 SAR altimeter on the Sentinel-6A Michael Freilich spacecraft.

Freshness

2026-04-09 22:21:09.034410

Geography

Global ocean coverage from the satellite's orbit.