Recommendation ITU-R P.1511-3
Policy on Intellectual Property Right (IPR)
1 Topography
1.1 Topographic height
2 WGS 84 Earth coordinate
system
2.1 WGS 84 reference
ellipsoid
2.2 WGS 84 reference
geoid
3 Calculation of look angles
and range between two stations in geodetic coordinates