By Qiming Zhou, Brian Lees, Guo-an Tang
Terrain research has been an lively learn box for years and attracted examine reviews from geographers, surveyors, engineers and laptop scientists. With the quick progress of Geographical info approach (GIS) expertise, rather the institution of excessive solution electronic Elevation types (DEM) at nationwide point, the problem is now excited by supplying justifiable socio-economical and environmental merits. The contributions during this booklet symbolize the state-of-the-art of terrain research equipment and methods in parts of electronic illustration, morphological and hydrological types, uncertainty and purposes of terrain research.
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Additional info for Advances in Digital Terrain Analysis (Lecture Notes in Geoinformation and Cartography) (Lecture Notes in Geoinformation and Cartography)
A discontinuous terrain partition framework (Miliaresis 2006) that identifies mountains (white pixels) from the surrounding basins (black pixels) in Asia Minor (SW Asia). For mountains (Miliaresis 2001a, 2006), seeds correspond to ridge points and the region growing criteria are defined on the basis of slope/elevation range and pixels that belong to the valley network. For alluvial fans (Miliaresis and Argialas 2000), drainage outlet points determine the seeds and the region growing criterion is based on slope (Figure 3).
Tomer and Anderson (1995) noted that the land surface is considered to be composed of deterministic (smooth) and noisy (non-smooth) components. This is a conceptual remark, not a mathematical one, because it is difficult to sub-divide topography into these components as they have similar internal properties. The sensitivity of local topographic variables to the noisy DEM component (and dependence of variables on grid mesh) increases in the following order (Shary et al. 2002): 1. functions of first derivatives (slope steepness, aspect, and insolation), 2.
They concluded that DEST provides better interpolation because it diminishes artificial flat areas where contour lines demonstrate high curvature. Models of Topography 41 Figure 9. Effects of Gibbs-like phenomena that result in artificial terraces delineated by profile curvature near contour lines (white) in relatively flat terrain portions, grid mesh 60 m). (a) – artificial terraces associated with contour lines, (b) – no artificial terraces are observed when SRTM grid is used for the same terrain at the same grid mesh.
Advances in Digital Terrain Analysis (Lecture Notes in Geoinformation and Cartography) (Lecture Notes in Geoinformation and Cartography) by Qiming Zhou, Brian Lees, Guo-an Tang