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A geodetic control framework is an artificial mathematically created mesh of coordinates that surround the earth to allow GIS users to place positional information on their data and cross-reference the data with accuracy. Without such a framework, the necessary manipulations of data gathered by coordinate would be useless—it is necessary to bring a common order to the data collection and manipulation. This entry summarizes the need and utility of such a framework in the creation and use of geographic data in a GIS.

Why are They Needed?

All GIS are based on an assumption that the coordinates of the points being used are known, or can be calculated. This process would be comparatively easy on a flat earth, but because the earth is a solid body, of ...

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