How does OrthoEngine deal with inputs that are in both feet and metre units?
There are a number of areas within OrthoEngine where units could be represented in feet or metres. You should carefully consider the units during the course of your project. 1) Units for the elevation of the input GCP’s 2) Units for the elevation of the input DEM. May be the same as GCP’s or may not be. 3) Units for the Output projection (i.e. FOOT or SPAF) 4) Units for the GCP projection (i.e. FOOT or SPAF) How this fits into your OrthoEngine workflow: 1) Options > Elevation Units: This is set based on the elevation of the GCPs imported from a text file, or the altitude as given in an exterior orientation file. If you are extracting GCP elevations from your DEM, then use the same units of elevation as your DEM. Default is meter. 2) DEM units for orthorectification: Currently (Version 9.0), if the elevation units of your DEM do not match the units of the Output Projection, then the “Elevation Scale” setting (under DEM options in the Ortho Generation panel) must be set to scale the data
