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

By Qiming Zhou, Brian Lees, Guo-an Tang

Terrain research has attracted study experiences from geographers, surveyors, engineers and machine scientists. The contributions during this e-book symbolize the state of the art of terrain research tools and methods in components of electronic illustration, morphological and hydrological versions, uncertainty and functions of terrain research. The ebook will attract postgraduate and senior undergraduate scholars who take complex classes in GIS and geographical analysis.

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Two kinds of restrictions in models of topography. a – a cave with negative slope steepness on its ceiling, b – Möbius’ strip as an example of a single–sided surface; its model is a sheet of paper ABCD connected at its edges AB and CD. Although the second restriction is always valid for the land surface (and models of single-sided surfaces are essentially not used in DTA), certain issues from differential geometry of surfaces were developed for singlesided surfaces, and this may result in some misunderstanding.

Such artefacts are characteristic of wiggly contour lines, because they result in interpolated smooth surface flattening (smaller gradient) near contours and steeper slopes between contours. g. Akima 1978), all apices of several triangles may have equal elevation values, introducing artificial flat areas at high contour curvature radius because they appear on the same contour line. As a result, profile curvature oscillates with zero values in the middle of each contour and halfway between adjacent contours (see Figure 9).

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). For bajadas (coalescent fans), streams emerging on the basin floor form the set of seeds (Figure 4), while the region growing criterion is based on slope combined with size dependent objects filtering and drainage pixel removal after the first iteration (Miliaresis 2001b).

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