+ " - **Ground Control Points** \"Ground control points, shown as blue stars in the figure below, are identifiable features located on earth surfaces that have known ground coordinates x,y, and z.\" Generally, the GCPs can be prepared in three ways: (1) Survey points that come in a form of x,y,z. You can input the coordinates into the control point table manually. (2) Ortho rectified image chips. If you have image chips for some features or locations within your block, create a mosaic dataset from these image chips, and compute control points from your mosaic dataset using the Compute Control Points tool, then add it to the control point table. And (3) Ortho rectified image service. You can also compute control points based on a single ortho rectified image or image service, and add them to the control point table check points. \"Check points are known ground control points, but instead of them being used in computing adjustment, they are used in checking the accuracy of adjustment computation.\" <a href=\"#References\">[4]</a> GCPs are used to georeference the images to the ground.\n",
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