When you select to view ground control points (GCP) as image points, Focus uses the pixel-and-line coordinates of the GCPs for the location information.
If the source file has a real projection, this projection is used, along with the upper-left coordinate and georeferencing (including rotation) of the file, and the stored pixel-and-line coordinates, to compute new geographic coordinates. If the source file does not have an associated math model, the generated vector layer is created with the same projection as the georeferencing of the file. If there is at least one math model, you can select to display the layer with georeferencing from the math model.
If the source file has only a Pixel projection, but no associated math model, the stored pixel-and-line coordinates of the image are used "as is" in the generated vector layer and a Pixel projection is applied.
To view GCPs as image points
If your file has at least one associated math model, a message appears, prompting you to select the georeferencing to use.
The layer is displayed with GCPs derived from the georeferencing of the file.
The Select Layer Georeferencing window appears. To select the math model georeferencing information, see Using the math model for georeferencing; otherwise, click OK.
The layer is displayed with GCPs derived from the georeferencing of the math model.
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