The link in the top-level comment addresses all of these concerns, among other considerations and carefully calibrated corrections. They clearly know what they

The link in the top-level comment addresses all of these concerns, among other considerations and carefully calibrated corrections. They clearly know what they are doing. They have a high quality map of the variations of gravity across the surface of the Earth. They also have a model that accounts for atmospheric drag. https://research.csiro.au/slrwavescoast/sea-level/measurements-and-data/sea-level-measurements/#SatAlt https://research.csiro.au/slrwavescoast/sea-level/measuremen...