Geographic Information System (GIS)
A Geographic Information System (GIS) manages,
analyzes, and displays databases of geographic
information. Quantum GIS (QGIS) supports shapefile
viewing and editing, spatial data storage with
PostgreSQL/PostGIS, projection on-the-fly, map
composition, and a number of other features via
a plugin interface. QGIS also supports display
of various georeferenced raster and Digital
Elevation Model (DEM) formats including
GeoTIFF, Arc/Info ASCII Grid, and USGS ASCII DEM.