It is possible to view and download high resolution satellite georeferenced images and conventional maps submitted by such services as Google Earth, Google Maps, Bing Maps, DigitalGlobe, Yandex, Yahoo! Maps, VirtualEarth, OpenStreetMap with SAS.Planet free program, Downloading maps is implemented as a release area (possibly non-rectangular), and in the process of moving around the map. Maps are updated frequently – the program will allow you to download only the new ones. One advantage is having georeferenced images to use in ArcGIS, gvSIG, QGIS, Erdas, ENVI, etc.