The Department of Geography at California State University, Northridge operates this FTP server for its students and the academic community of the California State University System. In it you will find more than 2,300 U. S. Geological Survey 30 meter DEM files of California. Each of these files contains more than 1 MB of data needed for the construction of topographic map terrain models. These ARE NOT graphic files that can be viewed directly. They require special interpreting software.
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The California Geographical Survey wishes to thank Mr. Russell Towle and Martin D. Adamiker for their contributions.
You can find a nationwide guide to USGS DEMs at Martin D. Adamiker's nationwide DEM guide.