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2. List of GIS data sources - Wikipedia

   en.wikipedia.org/wiki/List_of_GIS_data_sources

   Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools, and evaluations for ...

3. File:California county map (labeled).svg - Wikipedia

   en.wikipedia.org/wiki/File:California_county_map...

   Partition and secession in California; Wikipedia:Graphics Lab/Map workshop/Archive/Nov 2009; Category:California counties; Category:Companies based in California by county; Category:Economy of California by county; Category:Education in California by county; Category:High schools in California by county; Category:Universities and colleges in ...

4. History of the mapping of California - Wikipedia

   en.wikipedia.org/wiki/History_of_the_mapping_of...

   In 1841, Cadwalader Ringgold, an officer in the United States Navy, spent twenty days surveying the San Francisco Bay watershed as a member of the United States Exploring Expedition In 1849, Cadwalader Ringgold began a more comprehensive survey the San Francisco Bay region, [11] the Sacramento River, and parts of the American and created several maps which included depth sounding information ...

5. OpenStreetMap - Wikipedia

   en.wikipedia.org/wiki/OpenStreetMap

   OpenStreetMap was created by Steve Coast in response to the Ordnance Survey, the United Kingdom's national mapping agency, failing to release its data to the public under free licences in 2004. Initially, maps in OSM were created only via GPS traces , but it was quickly populated by importing public domain geographical data such as the U.S ...

6. File:Blank California Map.svg - Wikipedia

   en.wikipedia.org/wiki/File:Blank_California_Map.svg

   Blank map of the state of California, USA with counties shown. Date: 24 December 2007: Source: Self-made. HEAVILY modified manually from California_county_map.svg; style inspired by Frank Bennett: Author: Thadius856: Permission (Reusing this file) Original image public source (United States Census Bureau) Other versions

7. File:California blank map.svg - Wikipedia

   en.wikipedia.org/wiki/File:California_blank_map.svg

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.