SAGA-GIS Tool Library Documentation (v7.7.0)

Tool Breach Depressions

This tool removes all depressions in a DEM by breaching. It can be used to pre-process a digital elevation model (DEM) prior to being used for hydrological analysis. It uses a cost-distance criteria for deciding upon the breach target, i.e. the cell to which the tool will trench a connecting path, and for determining the breach path itself (from the WhiteBox GAT documentation).

This is a re-implementation of the 'Breach Depressions' Java code as provided by Dr. John Lindsay's WhiteBox GAT software.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid, inputDEM--
OutputPreprocessed (*)Grid, output, optionalNOSINKS--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Maximum Breach Channel LengthIntegerMAX_LENGTH[Cells]Minimum: 1
Default: 50
Maximum Elevation DecrementFloating pointMAX_ZDEC-Minimum: 0.000000
Default: 0.000000
Minimum Elevation DropFloating pointMIN_ZDROP-Minimum: 0.000000
Default: 0.000000
(*) optional

Command-line

Usage: saga_cmd ta_preprocessor 7 [-DEM <str>] [-NOSINKS <str>] [-MAX_LENGTH <num>] [-MAX_ZDEC <double>] [-MIN_ZDROP <double>]
  -DEM:<str>         	Elevation
	Grid, input
  -NOSINKS:<str>     	Preprocessed
	Grid, output, optional
  -MAX_LENGTH:<num>  	Maximum Breach Channel Length
	Integer
	Minimum: 1
	Default: 50
  -MAX_ZDEC:<double> 	Maximum Elevation Decrement
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -MIN_ZDROP:<double>	Minimum Elevation Drop
	Floating point
	Minimum: 0.000000
	Default: 0.000000