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Geographic Resources Analysis Support System (GRASS) is a general-purpose geographic information system (GIS) used for management, processing, analysis, modeling, and visualization of georeferenced data. Originally developed by the U.S. Army Corps of Engineers Construction Engineering Research Laboratories (1984–1993) as a tool for land management at military installations, its capabilities have been expanded to support geospatial analysis in the fields of hydrology, geography, ecology, business, and many others. GRASS is an open source/free software, released under the GNU General Public License (GPL) in 1999, and it is one of the founding projects of the Open Source Geospatial Foundation (OSGEO). It provides complete access to its source code written in the C programming language. GRASS is available for all commonly used operating systems, such as Linux, ...

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