grass: GRASS (Geographic Resources Analysis Support System) grass: grass: Commonly referred to as GRASS, this is a Geographic Information System grass: (GIS) used for geospatial data management and analysis, image grass: processing, graphics/maps production, spatial modeling, and grass: visualization. GRASS is currently used in academic and commercial grass: settings around the world, as well as by many governmental agencies and grass: environmental consulting companies. grass: grass: grass: