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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.
Version 1.0 was released in January 2009. [8] In 2013, along with release of version 2.0 the name was officially changed from Quantum GIS to QGIS to avoid confusion as both names had been used in parallel. [9] Written mainly in C++, QGIS makes extensive use of the Qt library. [6] In addition to Qt, required dependencies of QGIS include GEOS and ...
Shapefiles : are a data exchange format created by ESRI and one of the most widely used GIS/geodata formats. One "shapefile" usually include four different files : .shp, .shx, .dbf, .prj.
The shapefile format is a digital vector storage format for storing geographic location and associated attribute information. This format lacks the capacity to store topological information. 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 ...
QGis (full name: Quantum GIS) is a GPL license, cross-platform (Windows, Linux, Mac), and rather friendly cartographic software application. It is a Geographic Information System (GIS) program you can use to create, view, and analyze maps.
The most notable example of this was the publication of the Esri Shapefile format, [5] which by the late 1990s had become the most popular de facto standard for data sharing by the entire geospatial industry. [6]
The Spatial Data File (SDF) is a single-user geodatabase file format developed by Autodesk.The file format is the native spatial data storage format for Autodesk GIS programs MapGuide and AutoCAD Map 3D.
The GAUL always maintains global geographic layers (in shapefile format) with a unified coding system at the levels of country, first administrative (e.g. regions), and second administrative (e.g. districts). In addition, when data is available, it provides layers on a country-by-country basis down to third, fourth and lower levels.