WW2D is cross-platform, free and open-source version of NASA World Wind software, see http://worldwind.arc.nasa.gov for details. , topographic maps and image from other data sources also providing large placenames and boundaries database and allowing you to install community-made add-ons for even more information about our planet. In basic configuration WW2D uses images from Blue Marble (1 km/pixel), LandSat7 (15 m/pixel), USGS Topo Maps, USGS Digital Ortho imagery, USGS Urban Area imagery. WW2D is designed to dynamically download needed data from internet, however you can download data ... [ read more about WW2D >> ]