Celebrating 30 years!

30 YEARS OF GRASS GIS!GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is a free and open source Geographic Information System (GIS) software suite used for geospatial data management and analysis, image processing, graphics and maps production, spatial modeling, and visualization. GRASS GIS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. It is a founding member of the Open Source Geospatial Foundation (OSGeo).

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Newcomers: How to start with GRASS?

Screenshots (click for more)

GRASS GIS in Action
Module of the Day
r.clump Recategorizes data in a raster map by grouping cells that form physically discrete areas into unique categories.

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