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Topography is a general term in geography, derived from the Greek "topos" (place) and "graphein" (to draw), and refers to the lie of the land, or various other characteristics of Physical geography in a region; this is usually expressed in terms of the elevation, slope, and orientation of terrain features. The understanding of these features is an integral aspect of geography, encompassing the practice of cartography, surveying, and GIS. Maps are the most common communication tool for topographic information.

Relief often used to refer to the third dimension of a map whether in actuality (as in a "raised relief" map, or drawn, as with contours, hachures or shading) or the territory it describes. Most 18th and early 19th century national surveys did not record relief across the entire area of coverage, calculating only spot elevations at survey points. The United States Geological Survey (USGS) topographical survey maps included contour representation of relief, and so maps that show relief, especially with exact representation of elevation, came to be called topographic maps (or "topo" maps) in the United States, and the usage has spread internationally.

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

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Live free or die does not apply to avalanche terrain.
drew_zimber (Drew Zimber) Sun, 13 Dec 2009 11:13:17 -0000
Live free or die does not apply to avalanche terrain.
Live free or die in avalanche terrain.
eastbackcountry (Eastern Backcountry) Sun, 13 Dec 2009 11:08:36 -0000
Live free or die in avalanche terrain.
@202chicago The RDA's primary assault vehicle for nearly all terrain, called the "Swan" at http://avtr.com/qpX #Avatarmovie
amymathias31 (Amy Mathias) Sun, 13 Dec 2009 10:51:36 -0000
@202chicago The RDA's primary assault vehicle for nearly all terrain, called the "Swan" at http://avtr.com/qpX #Avatarmovie
@alejoperilla The RDA's primary assault vehicle for nearly all terrain, called the "Swan" at http://avtr.com/qpX #Avatarmovie
amymathias31 (Amy Mathias) Sun, 13 Dec 2009 10:43:30 -0000
@alejoperilla The RDA's primary assault vehicle for nearly all terrain, called the "Swan" at http://avtr.com/qpX #Avatarmovie
@cyclingamericas Lol, daren't even ask about your undies. Sounds like a weird lunar-like terrain you are passing through, such contrasts.
Marcard53 (Marcus Carding) Sun, 13 Dec 2009 10:40:24 -0000
@cyclingamericas Lol, daren't even ask about your undies. Sounds like a weird lunar-like terrain you are passing through, such contrasts.
@AlisonAngelari Check the heavily improved AMP suit, geared for the toxic terrain of Pandora at http://avtr.com/zc6 #Avatarmovie
amymathias31 (Amy Mathias) Sun, 13 Dec 2009 10:38:41 -0000
@AlisonAngelari Check the heavily improved AMP suit, geared for the toxic terrain of Pandora at http://avtr.com/zc6 #Avatarmovie

 
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