Using State Plane Coordinate systems

If the output projection is State Plane Coordinate System (SPCS) in feet or FOOT projection (SPAF, SPIF, and FOOT), all calculations are in feet. digital elevation models (DEM) can be in either feet or meters, provided GCP Elevation Units is set for GCP collection, and the elevation units are set on the Ortho Image Production window. If the output projection is changed, and there are some existing GCPs that cannot be projected onto the new output projection, they are changed into check points (CP), so that they do not affect the computation of the math model.

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