Tool Vertical Distance to Channel Network

This tool 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

Author: O.Conrad (c) 2002
Menu: Terrain Analysis|Channels

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	Grid, input	`ELEVATION`	A grid that contains elevation data.	-
Input	Channel Network	Grid, input	`CHANNELS`	A 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.	-
Output	Vertical Distance to Channel Network	Grid, output	`DISTANCE`	The resulting grid gives the altitude above the channel network in the same units as the elevation data.	-
Output	Channel Network Base Level (*)	Grid, output, optional	`BASELEVEL`	This optional grid output contains the interpolated channel network base level elevations.	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Tension Threshold	Floating point	`THRESHOLD`	Maximum change in elevation units (e.g. meter), iteration is stopped once maximum change reaches this threshold.	Minimum: 0.000000 Default: 1.000000
	Maximum Iterations	Integer	`MAXITER`	Maximum number of iterations, ignored if set to zero	Minimum: 0 Default: 0
	Keep Base Level below Surface	Boolean	`NOUNDERGROUND`	-	Default: 1
(*) optional

Command-line

Usage: saga_cmd ta_channels 3 [-ELEVATION <str>] [-CHANNELS <str>] [-DISTANCE <str>] [-BASELEVEL <str>] [-THRESHOLD <double>] [-MAXITER <num>] [-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, output, optional
  -THRESHOLD:<double> 	Tension Threshold
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -MAXITER:<num>      	Maximum Iterations
	Integer
	Minimum: 0
	Default: 0
  -NOUNDERGROUND:<str>	Keep Base Level below Surface
	Boolean
	Default: 1