Did you know❓📜ICAO Annex 15 and PANS-AIM define requirements for ⛰️🔢Digital Terrain Models (DTM).
⛰️🔢DTM or DEM (Digital Elevation Model) is an electronic representation of terrain surface. This data consists in elevation values at all intersections (points) of a grid with a specified spacing. Elevations are given in a defined “datum”, or vertical reference system. hashtag#Aeronauticalinformation is supposed to use the standard datum EGM-96, but many countries keep using …