Geodetic system is a coordinate system, and a set of reference points, used to locate places on the earth. Datums are used in geodesy, navigation, and surveying by cartographers and satellite navigation systems to translate positions indicated on maps to their real position on earth. Each starts with an ellipsoid and then defines latitude, longitude and altitude coordinates. The difference in co-ordinates between datums is commonly referred to as datum shift. Because the Earth is an imperfect ellipsoid, localised datums can give a more accurate representation of the area of coverage.
In surveying and geodesy, a datum is a reference system or an approximation of the Earth's surface against which positional measurements are made for computing locations. Horizontal datums are used for describing a point on the Earth's surface, in latitude and longitude or another coordinate system. Vertical datums are used to measure elevations or underwater depths. Generally, especially in survey life the coordinate system need to change especially we conduct a survey in different place with different coordinate system to match the data and to gain the good result.
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salam...macam mana nak dapatkan software GDTS ni?
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