Advances in Digital Terrain Analysis by Qiming Zhou, Brian Lees, Guo-an Tang

By Qiming Zhou, Brian Lees, Guo-an Tang

Terrain research has attracted examine reviews from geographers, surveyors, engineers and machine scientists. The contributions during this booklet characterize the state of the art of terrain research tools and strategies in components of electronic illustration, morphological and hydrological types, uncertainty and functions of terrain research. The booklet will entice postgraduate and senior undergraduate scholars who take complex classes in GIS and geographical analysis.

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The aspect regions continuous terrain partition framework allowed the identification of regions with high landslide hazards on the basis of aspect regions parametric representation and knowledge-based rules acquired by domain experts, while in Mars aspect regions modelling revealed the tectonic processes. SRTM DEMs seem to be capable of capturing aeolian processes on the basis of the morphometry of linear megadunes in desert regions. Geomorphometric analysis provides a quantitative way to compare developed and developing landscapes in areas of both differing and similar geologic structure.

A simple example of a finite difference at the central (5-th) point is z6  z 4 p5 2w ; for a smooth surface, the value of p5 should tend to partial derivative p5 = wz/wx at the point 5 as w tends to zero, but this limit may be absent in nonsmooth models of topography. To apply spatial averaging, one may use the average of finite differences evaluated at points 2, 5, and 8: p p  p5  p8 3 2 1 1 § z3  z1 z 6  z 4 z9  z 7 · ¨ ¸   2 w ¸¹ 3 ¨© 2 w 2w z3  z6  z9  z1  z 4  z7 . 6w This is the case of Evans–Young and some other algorithms used to calculate local variables described below in this section.

MILIARESIS Figure 9. The mountain terrain class in Valles Marineris (Mars). The white pixels represent the pixels labelled by the DEM-to-Mountain transformation (Miliaresis and Kokkas 2004). Additionally, the segmentation to aspect regions and their representation on the basis of mean elevation and mean gradient revealed the chasma terrain structure, proving that the basin floors of the elementary chasmata are interrupted by regions with higher mean elevation and gradient, due possibly to vertical tectonic movements (Miliaresis and Kokkas 2004).

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