Thursday, September 14, 2006
California DRGs from CASIL
The maps are organized into 1x1 degree blocks covering the state of California. The source maps for DRGs were georeferenced to the UTM grid, but DRG images for California are available in Albers equal area projection (see the projection information). A DRG is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of DLG data. Available as 7.5 minute, 30x60 minute, and 1x1 degree blocks - see http://archive.casil.ucdavis.edu/casil/maps/drg/ see also http://gis.ca.gov/DRG.epl
