SAGA 9.4.2 | Tool Library Documentation

Valley Depth


Description

Valley depth is calculated as difference between the elevation and an interpolated ridge level. Ridge level interpolation uses the algorithm implemented in the 'Vertical Distance to Channel Network' tool. It performs the following steps: - Definition of ridge cells (using Strahler order on the inverted DEM). - Interpolation of the ridge level. - Subtraction of the original elevations from the ridge level.


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationgrid, inputELEVATION--
OutputValley Depthgrid, outputVALLEY_DEPTH--
Ridge Levelgrid, output, optionalRIDGE_LEVEL--
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Tension Thresholdfloating point numberTHRESHOLDMaximum change in elevation units (e.g. meter), iteration is stopped once maximum change reaches this threshold.Minimum: 0.000000 Default: 1.000000
Maximum Iterationsinteger numberMAXITERMaximum number of iterations, ignored if set to zeroMinimum: 0 Default: 0
Keep Ridge Level above SurfacebooleanNOUNDERGROUND-Default: 1
Ridge Detection Thresholdinteger numberORDER-Minimum: 1 Maximum: 7 Default: 4

Command Line


Usage: saga_cmd ta_channels 7 [-ELEVATION ] [-VALLEY_DEPTH ] [-RIDGE_LEVEL ] [-THRESHOLD ] [-MAXITER ] [-NOUNDERGROUND ] [-ORDER ]
  -ELEVATION:    	Elevation
	grid, input
  -VALLEY_DEPTH: 	Valley Depth
	grid, output
  -RIDGE_LEVEL:  	Ridge Level
	grid, output, optional
  -THRESHOLD: 	Tension Threshold
	floating point number
	Minimum: 0.000000
	Default: 1.000000
  -MAXITER:      	Maximum Iterations
	integer number
	Minimum: 0
	Default: 0
  -NOUNDERGROUND:	Keep Ridge Level above Surface
	boolean
	Default: 1
  -ORDER:        	Ridge Detection Threshold
	integer number
	Minimum: 1
	Maximum: 7
	Default: 4