SAGA-GIS Tool Library Documentation (v6.1.0)

Tool Fractal Brownian Noise

This tool uses uniform random to create a grid that resembles fractal Brownian noise (FBN). The advantage of FBN noise is that it appears to have texture to the human eye, that resembles the types of textures that are observed in nature; terrains, algae growth, clouds, etc. The degree of texture observed in the FBN grid is dependent upon the sizes of the wavelengths chosen. The wavelengths should be chosen so they increase in size (a doubling of successive wavelengths is a good point to start). The greater the magnitude of the "ramp" of successive wavelengths the greater the texture in the FBN grid.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputTarget System (*)Grid (optional input)TEMPLATEuse this grid's system for output grids-
OutputFractal Brownian NoiseGrid (output)OUT_GRID--
OptionsTarget Grid SystemChoiceDEFINITION-Available Choices:
[0] user defined
[1] grid or grid system
Default: 0
CellsizeFloating pointUSER_SIZE-Minimum: 0.000000
Default: 1.000000
LeftFloating pointUSER_XMIN-Default: 0.000000
RightFloating pointUSER_XMAX-Default: 100.000000
BottomFloating pointUSER_YMIN-Default: 0.000000
TopFloating pointUSER_YMAX-Default: 100.000000
FitChoiceUSER_FITS-Available Choices:
[0] nodes
[1] cells
Default: 0
Grid SystemGrid systemSYSTEM--
ScalingChoiceSCALING-Available Choices:
[0] linear
[1] geometric
Default: 1
Maximum ScaleFloating pointMAX_SCALE-Minimum: 0.000000
Default: 1.000000
StepsIntegerSTEPS-Minimum: 1
Default: 8
Noise RangeValue rangeRANGE--
(*) optional

Command-line

Usage: saga_cmd grid_calculus 17 [-DEFINITION <str>] [-USER_SIZE <double>] [-USER_XMIN <double>] [-USER_XMAX <double>] [-USER_YMIN <double>] [-USER_YMAX <double>] [-USER_FITS <str>] [-TEMPLATE <str>] [-OUT_GRID <str>] [-SCALING <str>] [-MAX_SCALE <double>] [-STEPS <num>] [-RANGE_MIN <double>] [-RANGE_MAX <double>]
  -DEFINITION:<str>  	Target Grid System
	Choice
	Available Choices:
	[0] user defined
	[1] grid or grid system
	Default: 0
  -USER_SIZE:<double>	Cellsize
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -USER_XMIN:<double>	Left
	Floating point
	Default: 0.000000
  -USER_XMAX:<double>	Right
	Floating point
	Default: 100.000000
  -USER_YMIN:<double>	Bottom
	Floating point
	Default: 0.000000
  -USER_YMAX:<double>	Top
	Floating point
	Default: 100.000000
  -USER_FITS:<str>   	Fit
	Choice
	Available Choices:
	[0] nodes
	[1] cells
	Default: 0
  -TEMPLATE:<str>    	Target System
	Grid (optional input)
  -OUT_GRID:<str>    	Fractal Brownian Noise
	Grid (output)
  -SCALING:<str>     	Scaling
	Choice
	Available Choices:
	[0] linear
	[1] geometric
	Default: 1
  -MAX_SCALE:<double>	Maximum Scale
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -STEPS:<num>       	Steps
	Integer
	Minimum: 1
	Default: 8
  -RANGE_MIN:<double>	Noise Range
	Value range
  -RANGE_MAX:<double>	Noise Range
	Value range