Example image of eyePlorer eyePlorer map for 'Datum (geodesy)': Geodesy Geographic coordinate system Reference ellipsoid Surveying Earth Latitude Longitude Engineering Engineering drawing North America World Geodetic System Meades Ranch, Kansas North American Datum Global Positioning System International Earth Rotation and Reference Systems Service Sea level Cornwall Newlyn Nautical chart Chart datum Geography of Mars North American Vertical Datum of 1988 Quebec Geoid GRS 80 Geometric dimensioning and tolerancing Measurement Map projection Above mean sea level Australian Height Datum ED50 Fundamental station Hydraulic head Longhorn Dam Mansfield Dam New Zealand Map grid Normaal Amsterdams Peil Sea Level Datum of 1929 Subsidence Tom Miller Dam Canyon Dam Degree Confluence Project EUREF Permanent Network European Petroleum Survey Group Geodetic astronomy GeoTIFF Gila and Salt River Meridian Helmert transformation List of acronyms and initialisms: O Montana Meridian