Location information is determined based on the coordinate system, among which include datum and projection maps.Datum is a collection of parameters and control points which geometric relationships are known, either through measurement or calculation.While the map projection system is a system designed to represent the curved surface of a field or a spheroid (eg earth) on a flat field.This causes distortion of the representation process that needs to be taken into account to obtain the accuracy of some kinds of properties, such as distance, angle, or area.
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