SAGA 9.6.1 | Tool Library Documentation

Terrain Map View


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

 NameTypeIdentifierDescriptionConstraints
InputDEMgrid, inputDEMDigital elevation model.-
OutputShadegrid, output, optionalSHADEThe shaded DTM.-
Opennessgrid, output, optionalOPENNESSThe difference of positive and negative openness.-
Slopegrid, output, optionalSLOPEThe calculated terrain slope [radians].-
Contoursshapes, output, optionalCONTOURSThe generated contour lines.-
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
MethodchoiceMETHODChoose the map type to generate.Available Choices: [0] Topography [1] Morphology Default: 0
Radial Limitfloating point numberRADIUSRadial search limit for openness calculation.Minimum: 0.000000 Default: 1000.000000
Contour LinesbooleanCONTOUR_LINESDerive contour lines.Default: 1
Equidistancefloating point numberEQUIDISTANCEContour 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