international identifier for the base coordinate reference system (CRS) which was used to build this topography. e.g. EPSG:4326 = WGS-84 (lon/lat from GPS systems, used in OpenStreetMap) EPSG:25832 = ETRS89 / UTM Zone 32N (UTM Zone System) zone 32 contains most of germany. see https://de.wikipedia.org/wiki/European_Petroleum_Survey_Group_Geodesy#EPSG-Codes https://de.wikipedia.org/wiki/UTM-Koordinatensystem#Aufbau for references short description of epsgCode. e.g. "WGS-84 OpenStreetMap (OSM)" for none GIS nerds ;) Translation vector used to move topography to origin (0,0)