SAGA-GIS Tool Library Documentation (v6.1.0)

Tool Laplacian Filter

Other Common Names: Laplacian, Laplacian of Gaussian, LoG, Marr Filter

Standard kernel 1 (3x3):
0 | -1 | 0
-- + -- + --
-1 | 4 | -1
-- + -- + --
0 | -1 | 0

Standard kernel 2 (3x3):
-1 | -1 | -1
-- + -- + --
-1 | 8 | -1
-- + -- + --
-1 | -1 | -1

Standard kernel 3 (3x3):
-1 | -2 | -1
-- + -- + --
-2 | 12 | -2
-- + -- + --
-1 | -2 | -1

Parameters

 NameTypeIdentifierDescriptionConstraints
InputGridGrid (input)INPUT--
OutputFiltered Grid (*)Grid (optional output)RESULT--
OptionsGrid systemGrid systemPARAMETERS_GRID_SYSTEM--
MethodChoiceMETHOD-Available Choices:
[0] standard kernel 1
[1] standard kernel 2
[2] Standard kernel 3
[3] user defined kernel
Default: 3
Standard DeviationFloating pointSIGMAThe standard deviation, expressed as a percentage of the radius.Minimum: 0.000010
Default: 50.000000
Kernel TypeChoiceKERNEL_TYPEThe shape of the filter kernel.Available Choices:
[0] Square
[1] Circle
Default: 1
Kernel RadiusIntegerKERNEL_RADIUSThe kernel radius in cells.Minimum: 1
Default: 2
(*) optional

Command-line

Usage: saga_cmd grid_filter 2 [-INPUT <str>] [-RESULT <str>] [-METHOD <str>] [-SIGMA <double>] [-KERNEL_TYPE <str>] [-KERNEL_RADIUS <num>]
  -INPUT:<str>        	Grid
	Grid (input)
  -RESULT:<str>       	Filtered Grid
	Grid (optional output)
  -METHOD:<str>       	Method
	Choice
	Available Choices:
	[0] standard kernel 1
	[1] standard kernel 2
	[2] Standard kernel 3
	[3] user defined kernel
	Default: 3
  -SIGMA:<double>     	Standard Deviation
	Floating point
	Minimum: 0.000010
	Default: 50.000000
  -KERNEL_TYPE:<str>  	Kernel Type
	Choice
	Available Choices:
	[0] Square
	[1] Circle
	Default: 1
  -KERNEL_RADIUS:<num>	Kernel Radius
	Integer
	Minimum: 1
	Default: 2