It’s not at the “web-based, jump in – the water’s fine” stage (though they indicate that they are working towards this), but the United States Geologic Service (USGS) has developed a National Land Cover Database from 2001 LandSat imagery.
This information provides very detailed (98ft square) information on every piece of land in the lower 48 states. If you have an interest in this, and don’t mind working with database information, check out their web site!
from ResourceShelf
