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2. 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.

3. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   56,000 maps in digital raster graphic form were acquired on DVDs for $1600 to make the data available. [3] Additional data made available through the project includes SVG boundary files for every US state, Topologically Integrated Geographic Encoding and Referencing (Tiger)/Line 2003 vector map data, and the USGS GeoNames database.

4. 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 ...

5. Geodatabase (Esri) - Wikipedia

   en.wikipedia.org/wiki/Geodatabase_(Esri)

   The origin of the geodatabase was in the mid-1990s during the emergence of the first spatial databases.One early approach to integrating relational databases and GIS was the use of server middleware, a third-party program that stores the spatial data in database tables in a custom format, and translates it dynamically into a logical model that can be understood by the client software.

6. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web. AOL.

7. Biggsville Township, Henderson County, Illinois - Wikipedia

   en.wikipedia.org/wiki/Biggsville_Township...

   United States Census Bureau 2008 TIGER/Line Shapefiles "Biggsville Township". Geographic Names Information System. United States Geological Survey, United States Department of the Interior; United States National Atlas ^