Make sure that you put targets out there. With a known length and width, the images can be georeferenced by the target. This will also allow the images to be spliced together at the targets.
Plan it out, and place the targets accordingly.
Since you have the GPS location of the targets, you can bring them into any program, Autocad or Google Earth.
I have Autocad Civil 3D, so I can connect them if you would like, just PM me...
you would probably want to fly at about 1000 feet.
