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

By Qiming Zhou, Brian Lees, Guo-an Tang

Terrain research has been an energetic research box for years and attracted examine experiences from geographers, surveyors, engineers and machine scientists. With the speedy development of Geographical info approach (GIS) expertise, rather the institution of excessive answer electronic Elevation types (DEM) at nationwide point, the problem is now interested by offering justifiable socio-economical and environmental advantages. 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 types, uncertainty and functions of terrain research.

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Additional resources for Advances in Digital Terrain Analysis (Lecture Notes in Geoinformation and Cartography) (Lecture Notes in Geoinformation and Cartography)

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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). ). For example: x The area of the region occupied by the object is computed as the aggregate of the pixels constituting the object region multiplied by the area extent of each pixel.

Html (accessed 25 March, 2007). GTOPO30, (1996), One-km spacing digital elevation model. html (accessed 25 March, 2007). , Ben-Dor, E. , (2004), Topographic information of sand dunes as extracted from shading effects using Landsat images, Remote Sensing of Environment, 90: 190–209. , (2005), The Terrain analysis system: a tool for hydro-geomorphic applications, Hydrological Processes, 19: 1123–1130. Lillesand, T. , (1987), Remote Sensing and image interpretation, New York, USA: John Wiley and Sons.

Quantification of Terrain Processes 17 Figure 1. A continuous terrain partition framework (Miliaresis et al. 2005). (a) DEM of the study area in SW Greece; the darker the point, the greater its elevation. (b) The aspect regions are easily interpreted from the aspect image. Note that aspect was standardized to the 8 geographic directions defined in a raster representation, while an aspect region is formed by adjacent points with the same shade of grey. (c) Each aspect region is assigned to one of seven classes depending on the mean slope of the DEM points that form the aspect region and mapped by a unique shade of grey.

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