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Terrain Analysis
Three dimensional views of digital terrain models are mainly known from flight simulators or digital atlases. In this lesson you will learn about the information that can be derived from digital terrain models. These information products can be used in different ways and they can also be combined with non-terrain information.
In the first unit, an overview of possible information which can be derived from digital terrain models will be provided. In unit 2 you will learn about slope, aspect and curvature and how they can be derived from a raster or linear interpolated triangular irregular networks (TIN). You will also learn about examples of geomorphometry. Visibility analysis is the topic of unit 3. Using specific methods (for raster based, as well as linear interpolated TINs) visibility analysis allows you to determine whether a point is visible from a given location. In unit 4 you learn how to calculate the reflection and how to create a shaded relief map from a raster.
Learning Objectives
- You get an overview of the most important information products that can be derived from digital terrain models.
- You know the basic methods to derive the most important parameters of geomorphometry (slope, aspect and curvature). You know the fundamental techniques to calculate the visibility from a point in raster and linear TINs.
- You know how the visibility of a point in a grid or linear TIN based digital terrain model is calculated.
- You know the most important application of the visibility analysis.
- You know the principles of relief shading and are able to calculate the reflection of a raster cell.
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