Google Earth is a virtual map program developed by Google that renders a three-dimensional representation of Earth based primarily on satellite imagery. The program superimposes satellite images, aerial photography and GIS data onto a 3D globe, allowing users to explore cities and landscapes from various angles by entering addresses and coordinates or navigating with keyboard, mouse or touch screen.
Launched as a tool for armchair exploration, Google Earth now covers more than 97 per cent of the world and has become a resource for expedition planning, conservation mapping and public engagement with remote regions. The desktop application includes tools for measuring distance, viewing the Moon and Mars, and exploring the night sky. Users can overlay their own data using Keyhole Markup Language, while the web version features Voyager — curated in-programme tours often presented by scientists and documentarians. A flight simulator and integration with Street View extend its utility for reconnaissance and visual storytelling, though some nations have restricted access or requested obscuration of sensitive sites on grounds of privacy and national security.
