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control point

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  1. [surveying] An accurately surveyed coordinate location for a physical feature that can be identified on the ground. Control points are used in least-squares analysis and adjustment as the basis for improving the spatial accuracy of all other points to which they are connected. Control points have known integrity, such as a Public Land Survey System (PLSS) section corner.
  2. [accuracy] A point of known accuracy used when georeferencing map data, digitizing paper map data, or performing spatial adjustment operations, such as rubber sheeting.

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