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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. 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 ...

  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.

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  7. 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]

  8. 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.

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