San Jose State University Digital data for use in Geographic Information Systems is abundant on the Web. This guide will help you locate data at a regional and state level. Spatial data warehouses and GIS directories provide a broader range of sources.
All data is free and viewing software can be downloaded.
Bay Area coverage varies by data type. Provides geo-data for the Bay Area with over 15 GB of maps, images and downloadable data. Address, Landmark, LatLong, and Zip Code Locators available. Overlay data on roads, railways, environmental features, property lines, and municipal zones is available. Download 7.5-minute California quadrangle DEM files of the Bay Area from Point Reyes to Half Moon Bay and as far east as Antioch, Livermore, and Calaveras Reservoir.