Google Earth

Google Earth is a virtual globe program that is actually called Earth Viewer and created by Keyhole, Inc... The program charted the earth from superimposition of images collected from satelllite mapping, aerial photography and GIS 3D globe. Available in three different licenses : Google Earth, a free version with limited functionality; Google Earth Plus ($ 20), which has additional features, and Google Earth Pro ($ 400 per year), which is used for commercial use.