Uyini uhlelo lwe-geodetic?
I-geodetic datum noma i-geodetic system (futhi: i-geodetic reference datum, i-geodetic reference system, noma i-geodetic reference frame) iyi-datum yomhlaba wonke noma i-reference frame yokumela ngokunembile isikhundla sezindawo eMhlabeni noma eminye imizimba yeplanethi ngokusebenzisa izixhumanisi ze-geodetic. Izinsuku zibalulekile kunoma yibuphi ubuchwepheshe noma inqubo esekelwe endaweni, kuhlanganise ne-geodesy, ukuzulazula, ukuhlola, izinhlelo zolwazi lwezendawo, ukuzwa okukude, nokuhlela amabalazwe. I-horizontal datum isetshenziselwa ukukala indawo ebusweni bomhlaba, ngobubanzi nobude noma olunye uhlelo lokuxhumanisa; i-vertical datum isetshenziselwa ukukala ukuphakama noma ukujula maqondana nemvelaphi ejwayelekile, efana nezinga lolwandle eliphakathi (MSL). Kusukela kwasungulwa i-Global Positioning System (GPS), i-ellipsoid ne-datum i-WGS 84 esetshenziswayo ithathe indawo yabanye abaningi ezinhlelweni eziningi. I-WGS 84 ihloselwe ukusetshenziswa emhlabeni wonke, ngokungafani nemininingwane eminingi yangaphambili.