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Terrain is formed by concurrent processes operating on the underlying geological structures over geological time: Geomorphology is in large part the study of the formation of terrain or topography. Relief energy, which may be defined inter alia as "the maximum height range in a regular grid", is essentially an indication of the ruggedness or relative height of the terrain.
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Because it is related to the slope of surfaces within the area of interest and to the gradient of any streams present, the relief of a landscape is a useful metric in the study of the Earth's surface. The relief of a landscape can change with the size of the area over which it is measured, making the definition of the scale over which it is measured very important. A relief can be described qualitatively, such as a " low relief" or " high relief" plain or upland.
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It is the difference between maximum and minimum elevations within a given area, usually of limited extent.
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Relief (or local relief) refers specifically to the quantitative measurement of vertical elevation change in a landscape. Furthermore, a hilly or mountainous terrain can strongly impact the implementation of a new aerodrome and the orientation of its runways. Terrain will also affect range and performance of radars and terrestrial radio navigation systems.