Geologic map of Santa Cruz county, California: A digital database

The geologic map information was digitized from a stable original of the geologic map at 1:62,500 scale. The author manuscript (ink on a greenline) was scanned using a monochrome scanner with a resolution of 800 dots per inch. The scanned image was vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at latitude/longitude intersections. The scanned lines were edited interactively by hand using graphical user interface ALACARTE (Fitzgibbon, 1991, Fitzgibbon and Wentworth, 1991, Wentworth and Fitzgibbon, 1991). Scanning artifacts significant for display at a scale of 1:62,500 were corrected. The base map layer (sc-topo) was prepared by scanning a scale-stable clear film of the U.S Geological Survey, San Francisco Bay Region, sheet 3, 1:125,000 (1970) topographic map. The clear film was scanned using a monochrome scanner with a resolution of 400 dots per inch. The raster scan was converted to a GRID in ARC/INFO. The GRID was then vectorized and reprojected into UTM Projection using the latitude/longitude intersections as reference points. The arcs in the base layer have not been attributed.