1. Datum (geodesy)A geodetic datum (plural datums, not data) is a reference from which measurements are made. In surveying and geodesy, a datum is a set of reference points on the Earth's surface against which position measurements are made and (often) an associated model of the shape of the Earth to define a geographic coordinate system. Horizontal datums are used for describing a point on the Earth's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths.
Read “Datum (geodesy)” on English Wikipedia
Read “測地系” on Japanese Wikipedia
Read “Datum (geodesy)” on DBpedia
Read “Datum (geodesy)” on English Wikipedia
Read “測地系” on Japanese Wikipedia
Read “Datum (geodesy)” on DBpedia
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