GeoidHeightsDotNet Calculate Geoid Undulation according to EGM96. Usage Example double h = GeoidHeights.undulation(38.6281550, 269.7791550); References http:https://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html http:https://stackoverflow.com/questions/22196714/wgs84-geoid-height-altitude-offset-for-external-gps-data-on-ios http:https://gis.stackexchange.com/questions/15744/how-to-get-the-height-according-to-egm96-for-a-point License MIT