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Google Earth is a web and computer program created by Google that renders a 3D representation of Earth based primarily on satellite imagery. The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles. Users can explore the globe by entering addresses and coordinates, or by using ...
The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth 's sea level as an equipotential gravitational surface (see Geodetic datum § Vertical datum).
In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods. Traditional definitions require a topographic map to show both natural and artificial features. [1] A topographic ...
A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid.
The SRTM was flown on an 11-day mission of the Space Shuttle Endeavour in February 2000. [1] This NASA image used Landsat data to texture-map the surface created using SRTM Elevation data. The Cape Peninsula and Cape of Good Hope, South Africa, are visible in the foreground. [1] The Shuttle Radar Topography Mission (SRTM) is an international research effort that obtained digital elevation ...
An elevation of 5,165 m (16,946 ft) for Mount Ararat is given by some encyclopedias and reference works such as Merriam-Webster's Geographical Dictionary and Encyclopedia of World Geography. [45][46][47][48] However, a number of sources, such as the United States Geological Survey and numerous topographic maps indicate that the alternatively ...
Mount Everest relief map Profiles of the full elevation of Mount Everest In 1802, the British began the Great Trigonometrical Survey of India to fix, among other things, the locations, heights, and names of the world's highest mountains. Starting in southern India, the survey teams moved northward using giant theodolites, each weighing 500 kg (1,100 lb) and requiring 12 men to carry, to ...
Terrain cartography USGS topographic map of Stowe, Vermont with contour lines at 20-foot intervals Terrain cartography or relief mapping is the depiction of the shape of the surface of the Earth on a map, using one or more of several techniques that have been developed.