global_mapper wrote: »
If you don't care about where it is placed but just the scaling, I would choose Orthographic with meters. Then you can change the units to feet on the Projection tab of the Configuration dialog. If you want it placed correctly and it doesn't have coordinates, use the File->Rectify Imagery menu command or just select to manually rectify it when prompted.
Global Mapper Guru
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation