About Earth Explorer, This program integrates high resolution satellite imagery and map information together to provide a3D view of planet earth. Besides the vector map layers such as political boundaries, coastlines, islands, lakes and latitude-longitude grids, Earth Explorer also provides four types of point maps including 267 countries and regions, 40,000 ranked cities, 15,000 islands and 1,700 noteworthy historical earthquakes since 1980, and detailed tips information. You can rotate the globe, zoom in and out,or measure distance between any two points.