下载源码包 grass:
Commonly referred to as GRASS, this is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/map production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many government agencies and environmental consulting companies.
This package contains HTML documentation for the GRASS system.
Homepage: http://grass.itc.it/gdp/