Terrain, or relief, is the third or vertical dimension of land surface. When relief is described underwater, the term bathymetry is used. Topography has recently become an additional synonym, though in many parts of the world it retains its original more general meaning of description of place.

Terrain is used as a general term in physical geography, referring to the lie of the land. This is usually expressed in terms of the elevation, slope, and orientation of terrain features. Terrain affects surface water flow and distribution. Over a large area, it can affect weather and climate patterns.

Importance of terrain

The understanding of terrain is critical for a number of reasons.

* The terrain of a region largely determines its suitability for human settlement: flatter, alluvial plains tend to be better farming soils than steeper, rockier uplands.

*In terms of environmental quality, agriculture, and hydrology, understanding the terrain of an area enables the understanding of watershed boundaries, drainage characteristics, water movement, and impacts on water quality. Complex arrays of relief data are used as input parameters for hydrology transport models (such as the SWMM or DSSAM Models) to allow prediction of river water quality.

*Understanding terrain also supports on soil conservation, especially in agriculture. Contour plowing is an established practice enabling sustainable agriculture on sloping land; it is the practice of plowing along lines of equal elevation instead of up and down a slope.

*Terrain is militarily critical because it determines the ability of armed forces to take and hold areas, and to move troops and material into and through areas. An understanding of terrain is basic to both defensive and offensive strategy.

*Terrain is important in determining weather patterns. Two areas close to each other geographically may differ radically in precipitation levels or timing because of elevation differences or a "rain shadow" effect.


Geomorphology is in large part the study of the formation of terrain or topography. Terrain is formed by intersecting processes:
* Geological processes: migration of tectonic plates, faulting and folding, volcanic eruptions
* Erosional processes: water and wind erosion, landslides
* Extraterrestrial: meteorite impacts

Tectonic processes such as orogenies cause land to be elevated, and erosional (and weathering) processes cause land to be worn away to lower elevations.

"Land surface parameters" are quantitative measures of various morphometric properties of a surface. The most common examples are used to derive slope or aspect of a terrain or curvatures at each location. These measures can also be used to derive hydrological parameters that reflect flow/erosion processes. Climatic parameters are based on the modelling of solar radiation or air flow.

"Land surface objects" or landforms are definite physical objects (lines, points, areas) that differ from the surrounding objects. The most typical examples are lines of watersheds, stream patterns, ridges, break-lines, pools, borders of specific landforms etc.

See also

* Geomorphometry
* Cartographic relief depiction (2-D relief map)
* Raised-relief map (3-D relief map)
* Relief ratio
* Subterranea

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Look at other dictionaries:

  • Terrain — (et) …   Kölsch Dialekt Lexikon

  • terrain — [ terɛ̃ ] n. m. • 1155; du lat. terrenum, de l adj. terrenus « formé de terre » I ♦ 1 ♦ Étendue de terre (considérée dans son relief ou sa situation). ⇒ 1. sol. Terrain accidenté. Accident, plis de terrain, du terrain. La route épouse tous les… …   Encyclopédie Universelle

  • terrain — is best reserved for contexts in which a geographical or military assessment is being made (an uneven terrain / the peculiarities of the terrain) rather than as a simple synonym for area, ground, region, or tract. Figurative uses however can be… …   Modern English usage

  • Terrain — Sn Gelände, Gebiet per. Wortschatz fach. (17. Jh.) Entlehnung. Entlehnt aus frz. terrain m., dieses aus l. terrēnum Erde, Acker , einer Substantivierung von l. terrēnus erdig, irden , zu l. terra f. Erde .    Ebenso nndl. terrein, ne. terrain,… …   Etymologisches Wörterbuch der deutschen sprache

  • terrain — 1727, ground for training horses, from Fr. terrain piece of earth, ground, land, from O.Fr. (12c.), from V.L. *terranum, from L. terrenum land, ground, from neut. of terrenus of earth, earthly, from terra earth, land, lit. dry land (as opposed to …   Etymology dictionary

  • Terrain — »Gebiet, Gelände; Boden, Baugelände, Grundstück«: Das Fremdwort wurde im 17. Jh. aus gleichbed. frz. terrain entlehnt, das auf lat. terrenum (vlat. *terranum) »Erdstoff; Erde, Acker« beruht. Das diesem zugrunde liegende Adjektiv lat. terrenus… …   Das Herkunftswörterbuch

  • Terrain — (fr., spr. Terräng), 1) ein Theil der Oberfläche der Erde, welcher nicht Meer ist, als ein Ganzes betrachtet; 2) Erdgegend, Gelände, Grund, Boden; 3) in Beziehung auf dessen Tauglichkeit u. Anwendung zu einem bestimmten Zwecke, z.B. zu Gewinnung… …   Pierer's Universal-Lexikon

  • Terrain — (franz., spr. terräng), »Erdgegend«, Grund und Boden, besonders in bezug auf die Oberflächenbeschaffenheit, das Gelände (s. d. und Terrainlehre). – In der Geologie ist T. meist gleichbedeutend mit Formation, z. B. T. houiller:… …   Meyers Großes Konversations-Lexikon

  • Terrain — (frz., spr. räng), Gelände, Gestaltung der Erdoberfläche einer Gegend, bes. im Kriegswesen hinsichtlich des Einflusses auf Stellung und Bewegung der Truppen; danach wird reines und kupiertes T. (s. Kupieren), offenes und bedecktes, ebenes und… …   Kleines Konversations-Lexikon

  • Terrain — (–räng), frz., Grund, Boden; im Kriegswesen die Beschaffenheit der Bodenoberfläche in Bezug auf die Ausführung von Operationen …   Herders Conversations-Lexikon

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