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San Diego is fortunate in that we have access to great GIS data for free - this is not typical! The top GIS data sources for San Diego are listed below. City, county or state agencies also have a wealth of data that can be easily converted for use in a GIS.
An online crime mapping website from ARJIS (Automated Regional Justice Information System. The crime mapping application allows you to select a location, incident type and time period to map. Map can be exported and data can be copied/pasted into a table to then be used in a GIS.
The San Diego Solar Siting Survey data spreadsheet (Excel) contains details for each site that are used to create the Solar Siting Survey map, a Google Maps mashup shows the location of solar installations in San Diego County.
This site contains historic data regarding the Tijuana River watershed and the October 2003 San Diego Wildfires. File formats are Arc/Info export files and shapefiles respectively. It was previously hosted by the SDSU Dept. of Geography.
Excellent site for free GIS data specific to San Diego County. Also created some new visualizations using GIS data that are interesting to see. To get to the Data Warehouse, go to the left side navigation under "Resources" and choose "Demographics and Other Data".
One of the best sites to get GIS data for San Diego. Almost 100 free GIS data layers available for public download. Majority of these, including historical dates, are available through the Geisel Library Data & GIS Lab with improved metadata.
A website with interactive maps of historical redlining. Users can click on the designated category and read the descriptions of the areas from a redlining perspective. Very very interesting commentary. Uses GIS to manage this data and present it.
This site is maintained by the Planning Data & Systems Department of Campus Planning at UC San Diego. There is building information, GIS campus maps, 'neighborhood' plans of campus, CAD drawings, and GIS campus maps. Much content needs a password so contact them directly for access.