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  2. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    This is a list of GIS data sources (including some geoportals) that provide information sets that can be used in geographic information systems (GIS) and spatial databases for purposes of geospatial analysis and cartographic mapping. This list categorizes the sources of interest.

  3. 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.

  4. Geographic information system - Wikipedia

    en.wikipedia.org/wiki/Geographic_Information_System

    GIS data acquisition includes several methods for gathering spatial data into a GIS database, which can be grouped into three categories: primary data capture, the direct measurement phenomena in the field (e.g., remote sensing, the global positioning system); secondary data capture, the extraction of information from existing sources that are ...

  5. Geographic data and information - Wikipedia

    en.wikipedia.org/wiki/Geographic_data_and...

    There are also many different types of geodata, including vector files, raster files, geographic databases, web files, and multi-temporal data. Spatial data or spatial information is broader class of data whose geometry is relevant but it is not necessarily georeferenced , such as in computer-aided design (CAD), see geometric modeling .

  6. Data model (GIS) - Wikipedia

    en.wikipedia.org/wiki/Data_model_(GIS)

    The georelational data model was the basis for most early vector GIS software. [19] The geometric data and the attribute data are stored separately; this was originally because the geometric data required GIS-specific code to process it, but existing relational database software (RDBMS) could be

  7. Open Source Geospatial Foundation - Wikipedia

    en.wikipedia.org/wiki/Open_Source_Geospatial...

    GRASS GIS – extensible GIS for image processing and analysing raster, topological vector and graphic data. OSSIM – Libraries and applications used to process imagery, maps, terrain, and vector data. Marble – Virtual globe and world atlas. gvSIG – Desktop GIS for data capturing, storing, handling, analysing and deploying. Includes map ...

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  9. 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]

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