I found this cool website for creating GPS maps that can be downloaded into a handheld GPS. The thing is the maps are pictures from a satellite. This could be a cool tool for diorama's.

TerraServer

Here's a sample:

http://terraserver-usa.com/image.aspx?t=1&s=11&x=953&y=10227&z=18&w=1

http://terraserver-usa.com/image.aspx?T=1&S=10&X=2581&Y=17786&Z=12&W=2&ref=F|B-52+Aircraft%2c+Davis-Monthan+AFB%2c+Tucson%2c+Arizona