GMT (Generic Mapping Tools) shell scripts mapping geoid undulation from EGM global gravity models (EGM2008, EGM96) over countries, seas and ocean trenches, with colour-shaded grids, geoid contours, conic/Eckert projections and a global geoid inset.
cartography geoscience generic-mapping-tools geophysics scientific-visualization geodesy gmt shell-scripting bathymetry geoid map-projection gravimetry gravity-model geospatial-visualization egm2008 potential-field egm96 grid-processing geoid-undulation earth-gravity
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Updated
Sep 12, 2026 - Shell