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  2. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    NHGIS provides free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2012. Atlas of Historical County Boundaries Project (AHCBP) The AHCBP documents all boundary changes in states and counties in United States territory, including non-county areas never before compiled or mapped ...

  3. File:California counties outline map.svg - Wikipedia

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

    File:California_county_map.svg licensed with PD-USGov-DOC-Census 2006-09-21T21:01:46Z Tintazul 512x857 (722537 Bytes) County map corrected and coloured, with FIPS subcode; 2006-01-02T19:09:38Z Fastfission 94x160 (723356 Bytes) Vector map of California showing state and county borders. Derived from a US Census publication.

  4. Topologically Integrated Geographic Encoding and Referencing

    en.wikipedia.org/wiki/Topologically_Integrated...

    The TIGER files do not contain the census demographic data, but merely the geospatial/map data. GIS can be used to merge census demographics or other data sources with the TIGER files to create maps and conduct analysis. TIGER data is available without cost because U.S. Government publications are required to be released into the public domain.

  5. Wikipedia : WikiProject Maps/Source materials

    en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps/...

    Libre Map Project - United States maps and GIS data released under the Creative Commons BY-SA license. Data includes many USGS DRG maps, TIGER/Map data, and boundary maps. (Also available at Internet Archive USGS Maps) DEMIS World Map Server generates maps using public domain data with no usage restrictions; Geospatial One-Stop geodata.gov

  6. Shapefile - Wikipedia

    en.wikipedia.org/wiki/Shapefile

    The shapefile format is a geospatial vector data format for geographic information system (GIS) software.It is developed and regulated by Esri as a mostly open specification for data interoperability among Esri and other GIS software products. [1]

  7. Date/Time Thumbnail Dimensions User Comment; current: 09:14, 1 January 2008: 621 × 733 (258 KB): Thadius856 {{Information |Description=County map of California, showing different geographical regions of the state.