Датума__

Datum is a set of parameters used in geodesy and cartography for transforming and adjusting reference ellipsoids into local geographic coordinates. The term 'Datum' is used to approximate the geoid in a specific location. (Datum - English term for a set of parameters used in geodesy and cartography to transform and adjust reference ellipsoids into local geographic coordinates.) Wikipedia (10Kb, last updated 24.01.2009) provides detailed information on this concept. A saved copy and additional resources are available. (Saved copy and additional resources are accessible.)