SAGA-GIS Module Library Documentation (v2.1.3)

Module Valley Depth

Valley depth is calculated here vertical distance to a channel network base level. The algorithm consists of two major steps:
1. Interpolation of a channel network base level elevation
2. Subtraction of this base level from the original elevations

Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid (input)ELEVATION--
OutputValley DepthGrid (output)VALLEY_DEPTH--
Ridge Level (*)Grid (optional output)RIDGE_LEVEL--
OptionsTension Threshold [Percentage of Cell Size]Floating pointTHRESHOLD-Minimum: 0.000000
Default: 1.000000
Keep Ridge Level above SurfaceBooleanNOUNDERGROUND-Default: 1
Ridge Detection ThresholdIntegerORDER-Minimum: 1
Maximum: 7
Default: 4
(*) optional

Command-line

Usage: saga_cmd ta_channels 7 -ELEVATION <str> [-VALLEY_DEPTH <str>] [-RIDGE_LEVEL <str>] [-THRESHOLD <str>] [-NOUNDERGROUND <str>] [-ORDER <num>]
  -ELEVATION:<str>    	Elevation
	Grid (input)
  -VALLEY_DEPTH:<str> 	Valley Depth
	Grid (output)
  -RIDGE_LEVEL:<str>  	Ridge Level
	Grid (optional output)
  -THRESHOLD:<str>    	Tension Threshold [Percentage of Cell Size]
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -NOUNDERGROUND:<str>	Keep Ridge Level above Surface
	Boolean
	Default: 1
  -ORDER:<num>        	Ridge Detection Threshold
	Integer
	Minimum: 1
	Maximum: 7
	Default: 4