The National Geodetic Survey (NGS) has published a technical report that describes options for how NGS can implement a time-dependent geopotential datum and thus a time-dependent geoid model. My last ...
My last column highlighted two components of the North American-Pacific Vertical Datum of 2022 (NAPGD2022) — the geoid undulation model of GEOID2022 and gravity model of GRAV2022. It expressed that ...
THE aim of my article was to show that the theoretical result derived by Cook 1 (that the low-degree harmonics of the geopotential originate from the area of the core–mantle boundary) is in accordance ...
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