SAGA-GIS Module Library Documentation (v2.1.3)

Module Vertical Distance to Channel Network

This module calculates the 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)ELEVATIONA grid that contains elevation data.-
Channel NetworkGrid (input)CHANNELSA grid providing information about the channel network. It is assumed that no-data cells are not part of the channel network. Vice versa all others cells are recognised as channel network members.-
OutputVertical Distance to Channel NetworkGrid (output)DISTANCEThe resulting grid gives the altitude above the channel network in the same units as the elevation data.-
Channel Network Base Level (*)Grid (optional output)BASELEVELThis optional grid output contains the interpolated channel network base level elevations.-
OptionsTension Threshold [Percentage of Cell Size]Floating pointTHRESHOLD-Minimum: 0.000000
Default: 1.000000
Keep Base Level below SurfaceBooleanNOUNDERGROUND-Default: 1
(*) optional

Command-line

Usage: saga_cmd ta_channels 3 -ELEVATION <str> -CHANNELS <str> [-DISTANCE <str>] [-BASELEVEL <str>] [-THRESHOLD <str>] [-NOUNDERGROUND <str>]
  -ELEVATION:<str>    	Elevation
	Grid (input)
  -CHANNELS:<str>     	Channel Network
	Grid (input)
  -DISTANCE:<str>     	Vertical Distance to Channel Network
	Grid (output)
  -BASELEVEL:<str>    	Channel Network Base Level
	Grid (optional output)
  -THRESHOLD:<str>    	Tension Threshold [Percentage of Cell Size]
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -NOUNDERGROUND:<str>	Keep Base Level below Surface
	Boolean
	Default: 1