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Elevation
The '''elevation''' of a geographic location (geography)|location is its height above a fixed reference point, often the above mean sea level|mean sea level. Elevation, or '''geometric height''', is mainly used when referring to points on the Earth's surface, while '''altitude''' or '''geopotential height''' is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit.
Less commonly, elevation is measured using the center of the Earth as the reference point. Due to equatorial bulge, there is debate whether the summits of Mount Everest|Mt. Everest or Chimborazo (volcano)|Chimborazo are at the higher elevation, as the Chimborazo summit is further from the Earth's center while the Mt. Everest summit is higher above mean sea level.
Maps and GIS
A topographic map|topographical map is the main type of map used to depict elevation, often through use of contour lines.
In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations. Digital terrain models are another way to represent terrain in GIS.
To determine elevation of a place, it must be geophysical survey|surveyed, in reference to a ground control point.
Topography
The elevation of a mountain usually refers to its topographical summit|summit. The elevation of a hill also refers to the summit. A valley's elevation is ''usually'' taken from the lowest point but is often taken all over the valley.
See also
- altitude
- geodesy
- geodesy of North America
- *Sea Level Datum of 1929 later National Geodetic Vertical Datum of 1929 (NGVD 29)
- *North American Vertical Datum of 1988 (NAVD 88)
- Highest mountain peaks of North America
- List of highest mountains
- List of highest towns by country
- physical geography
- summit (topography)
- topographic isolation
- topographic map
- topographic prominence
- topography
External links
- U.S. National Geodetic Survey website
- Geodetic Glossary @ NGS
- NGVD 29 to NAVD 88 online elevation converter @ NGS
- United States Geological Survey website
- Geographical Survey Institute
- Downloadable ETOPO2 Raw Data Database (2 minute grid)
- Downloadable ETOPO5 Raw Data Database (5 minute grid)
- bivouac.com Canadian Mountain Encyclopedia
- peakbagger.com
- peaklist.org
- peakware.com World Mountain Encyclopedia
- summitpost.org
Category:Geodesy
Category:Topography
Category:Physical geography
Category:Surveying
Category:Mountaineering
Category:Length
simple:Height
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Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL
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