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2. Topologically Integrated Geographic Encoding and Referencing

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

   TIGER data published through February 2007 (2006 Second Edition) were in a custom text-based format formally known as TIGER/Line files. In 2008, data in shapefile format was published. Please note that shapefiles are not topological, therefore may create slivers when comparing TIGER/Line boundaries.

3. List of GIS data sources - Wikipedia

   en.wikipedia.org/wiki/List_of_GIS_data_sources

   U.S. Gazetteer, TIGER/Line shapefiles, census data. National Historical Geographic Information System: 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)

4. QGIS - Wikipedia

   en.wikipedia.org/wiki/QGIS

   QGIS is a geographic information system (GIS) software that is free and open-source. [2] QGIS supports Windows, macOS, and Linux. [3] It supports viewing, editing, printing, and analysis of geospatial data in a range of data formats.

5. GIS file format - Wikipedia

   en.wikipedia.org/wiki/GIS_file_format

   Digital line graph (DLG) – a USGS format for vector data; TIGER – Topologically Integrated Geographic Encoding and Referencing; Vector Product Format (VPF) – National Geospatial-Intelligence Agency (NGA)'s format of vectored data for large geographic databases; Spatial Data File – Autodesk's high-performance geodatabase format, native ...

6. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   The Libre Map Project was started by Jared Benedict and around 100 additional individuals contributing money to purchase (or "liberate") a full set of 1:24K scale USGS topographic maps in Digital raster graphic form. [1]

7. SAGA GIS - Wikipedia

   en.wikipedia.org/wiki/SAGA_GIS

   System for Automated Geoscientific Analyses (SAGA GIS) is a geographic information system (GIS) computer program, used to edit spatial data.It is free and open-source software, developed originally by a small team at the Department of Physical Geography, University of Göttingen, Germany, and is now being maintained and extended by an international developer community.

8. Shapefile - Wikipedia

   en.wikipedia.org/wiki/Shapefile

   The shapefile format was introduced with ArcView GIS version 2 in the early 1990s. It is now possible to read and write geographical datasets using the shapefile format with a wide variety of software. The shapefile format stores the geometry as primitive geometric shapes like points, lines, and polygons.

9. OpenStreetMap - Wikipedia

   en.wikipedia.org/wiki/OpenStreetMap

   OpenStreetMap (abbreviated OSM) is a free, open map database updated and maintained by a community of volunteers via open collaboration. [4] Contributors collect data from surveys, trace from aerial photo imagery or satellite imagery, and import from other freely licensed geodata sources.