This image was started with a scanned paper aerial photo. Paint Shop Pro was used to combine the 2D scanned photo with a USGS topographic map, using the state highway running along the river as the transition line. (The map and photo were first adjusted to matching scales, which can be accomplished by loading the two bitmaps into separate layers and then stretching one layer until it matches the other. The map of the river was then cloned into the aerial photo.) The combined image was finally applied as an overlay in 3DEM. Click here for a full-sized 3D view.