Terrain Map View
- Author: Copyrights (c) 2014 by Volker Wichmann
- Menu: Visualization | Grid
Description
This tool allows one to create different terrain visualisations from an elevation dataset: * Topography: a simple map with an analytical hillshading of the terrain * Morphology: a map which visualizes the terrain by combining positive and negative openness (Yokoyama et al. 2002) with terrain slope in a single map. In contrast to conventional shading methods this has the advantage of being independent from the direction of the light source. References: Yokoyama, R. / Shirasawa, M. / Pike, R.J. (2002): Visualizing topography by openness: A new application of image processing to digital elevation models. Photogrammetric Engineering and Remote Sensing, Vol.68, pp.251-266. online at ASPRS.
Parameters
Name | Type | Identifier | Description | Constraints | |
---|---|---|---|---|---|
Input | DEM | grid, input | DEM | Digital elevation model. | - |
Output | Shade | grid, output, optional | SHADE | The shaded DTM. | - |
Openness | grid, output, optional | OPENNESS | The difference of positive and negative openness. | - | |
Slope | grid, output, optional | SLOPE | The calculated terrain slope [radians]. | - | |
Contours | shapes, output, optional | CONTOURS | The generated contour lines. | - | |
Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
Method | choice | METHOD | Choose the map type to generate. | Available Choices: [0] Topography [1] Morphology Default: 0 | |
Radial Limit | floating point number | RADIUS | Radial search limit for openness calculation. | Minimum: 0.000000 Default: 1000.000000 | |
Contour Lines | boolean | CONTOUR_LINES | Derive contour lines. | Default: 1 | |
Equidistance | floating point number | EQUIDISTANCE | Contour lines equidistance [map units]. | Minimum: 0.000000 Default: 50.000000 |
Command Line
Usage: saga_cmd grid_visualisation 8 [-DEM] [-SHADE ] [-OPENNESS ] [-SLOPE ] [-CONTOURS ] [-METHOD ] [-RADIUS ] [-CONTOUR_LINES ] [-EQUIDISTANCE ] -DEM: DEM grid, input -SHADE: Shade grid, output, optional -OPENNESS: Openness grid, output, optional -SLOPE: Slope grid, output, optional -CONTOURS: Contours shapes, output, optional -METHOD: Method choice Available Choices: [0] Topography [1] Morphology Default: 0 -RADIUS: Radial Limit floating point number Minimum: 0.000000 Default: 1000.000000 -CONTOUR_LINES: Contour Lines boolean Default: 1 -EQUIDISTANCE: Equidistance floating point number Minimum: 0.000000 Default: 50.000000