USGS has a whole bunch of benchmarks (just got one from a relative who works there). Check out their site www.geositu.com
just realized that this site is the same as the mountainclimb site mentioned earlier.
USGS has a whole bunch of benchmarks (just got one from a relative who works there). Check out their site www.geositu.com
just realized that this site is the same as the mountainclimb site mentioned earlier.