https://www.mathworks.com/help/aerotbx/ug/gravitywgs84.html
gravitywgs84 - Implement 1984 World Geodetic System (WGS84) representation of Earth gravity - MATLAB
This MATLAB function implements the mathematical representation of the geocentric equipotential ellipsoid of WGS84 using altitude h and geodetic latitude lat.
world geodetic system
https://commons.wikimedia.org/wiki/Category:World_Geodetic_System_1984
Category:World Geodetic System 1984 - Wikimedia Commons
world geodetic system 1984categorywikimediacommons