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Ocean s and Continent s exemplify the highest-order landforms. Landform Element s are parts of a high-order landform that can be further identified, such as hill-top, shoulder, backslope. Some generic landform elements are: pits, peaks, channels, ridges, passes, pools, planes; these can be often extracted from a digital elevation model using some automated techniques Automated landform classification using DEMs where the data (various kinds) has been gathered by modern satellites and Stereoscopic Aerial Surveilance cameras. Until recently, compiling the data found in such data sets required time consuming and expensive techniques of "Boots on the ground" at many man-hours. Terrain (or '''relief''') is the third or vertical dimension of '''land surface'''. When relief is described Underwater , the term Bathymetry is used. Topography is a further Synonym , and is often illustrated in the form of a Contour Map . Elementary landforms (segments, facets, relief units) are the smallest homogeneous divisions of the land surface, at the given scale/resolution. These are areas with relatively homogenuous Morphometric properties, bounded by lines of discontinuity. A plateau or a hill can be observed at various scales ranging from few hundred meters to hundreds of kilometers. Hence, the spatial distribution of landforms is often scale-dependent as is the case for soils and geological strata. A number of factors, ranging from Plate Tectonics to Erosion and Deposition can generate and affect landforms. Biological factors can also influence landforms— for example, note the role of Vegetation in the development of Dune systems and Salt Marsh es, and the work of Coral s and Alga e in the formation of Coral Reefs . Landforms do not include man-made features, such as Canal s, Port s and many Harbor s; and geographic features, such as Desert s, Forest s, Grassland s, and impact Crater s. Many of the terms are not restricted to refer to features of the planet Earth , and can be used to describe surface features of other planets and similar objects in the Universe . LIST OF LANDFORMS
Landforms produced by erosion and weathering usually occur in coastal or fluvial environments, and many appear under those headings. Some other erosion landforms that do not fall into those categories include:
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