The following supported units do not have any associated projection information and cannot be projected to equivalent LONG/LAT or projection coordinates:
NOTE: METRE or FOOT can have an Earth model (either a datum code or ellipsoid code) specified. (The default is METRE or FOOT with no Earth model.)
In OrthoEngine, when METRE or FOOT is used as the units, an Earth model has to be selected as the equatorial and polar radii are used in the calculations.
For other products (for example, EASI programs), no Earth model is used directly for METRE or FOOT so specifying the Earth model is optional.
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