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by dwaltrip 2422 days ago
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/measuremen...