geographiclib-get-gravity man page
geographiclib-get-gravity -- a GeographicLib administrative tool
geographiclib-get-gravity downloads and installs the gravity datasets used by GeographicLib, <https://geographiclib.sourceforge.io>. For documentation, supply the -h option:
By default, the datasets are installed in /usr/share/GeographicLib/gravity and the script requires write access to this directory.