Cinzia, one of the instructors for the Remixing El Presidio project, has created some incredible geospatial mash-ups with Google Earth and Sketchup. First, Sal’s 1792 plan of the Presidio with the 1812 extension of the main quadrangle overlay in yellow:
My favorite is the 3D model she created with sketchup:
You can adjust things like the time of day to check out the color variations and the shadows:
If you want to check it out for yourself, just download this folder and open the files in Google Earth!
More permanent hosting TBA.