GRASS GIS - Bringing advanced geospatial technologies to the world

GRASS GIS offers powerful raster, vector, and geospatial processing engines in a single integrated software suite. It includes tools for terrain and ecosystem modeling, hydrology, visualization of raster and vector data, management and analysis of geospatial data, and the processing of satellite and aerial imagery. It comes with a temporal framework for advanced time series processing and a Python

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“GRASS (Geographic Resources Analysis Support System), is a free and open source Geographic Information System (GIS) software suite”