Lecture 05: Digital Terrain Analysis I

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Presentation transcript:

Lecture 05: Digital Terrain Analysis I Topics: Basic Terrain Attributes Viewshed Shaded relief References: Zevenbergen and Thorne, 1987. “Quantitative analysis of surface topography”, Earth Surface Processes and Landforms, Vol. 12, pp. 47-56 Mitasova, H., and J. Hofierka, 1993. “Interpolation by regularized spline with tension: II. Application to terrain modeling and surface geometry analysis”, Mathematical Geology, Vol. 25, pp. 657 - 669

Lecture 05: Digital Terrain Analysis I Outlines 1. Basic Terrain Attributes: (The 3x3 DEM kernel Figure) Slope gradient (The Gradient Equation Figure) Slope aspect (The Aspect Equation Figure) Profile Curvature (The Profile Curvature Equation Figure) Planform Curvature (The Planform Curvature Equation Figure)

2. Viewshed Analysis: 1) What is a viewshed: 2) Line of Sight: (The Line of Sight Figure) 3) Viewshed Analysis: (The Viewshed Figure)

3. Shaded relief (hill shading): (The Shaded relief Figure in Burrough’s) 1) What is shaded relief map: 2) Shaded relief calculations: a) Principle: i. orientation of a given surface (slope gradient and slope aspect) ii. a model of light reflection b) Calculation: (The shaded relief calculation Figure) Examples: (The shaded relief maps of Lubrecht)