land use data cover raster polygon sets usgs ds comparison documenting creation pubs gov 2006
land use cover usgs scale generalized minnesota ds survey geological quadrangle figure roseau modified 1990s data pubs gov 2006
usgs land sets data cover use ds enhanced historical list
land cover use data usgs ds polygon coordinate conversions geographic format system pubs gov 2006
land use data survey cover usgs ds diagram geological analysis flow steps system development format historical polygon edits processing protection
land cover use data ds usgs polygon developed coding pubs gov 2006