SAGA-GIS Tool Library Documentation (v7.8.2)

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, input, optional, CMDTARGET_TEMPLATEuse this grid's system for output grids-
OutputFractal Brownian NoiseGrid, outputOUT_GRID--
OptionsScalingChoiceSCALING-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--
Target Grid SystemChoiceTARGET_DEFINITION-Available Choices:
[0] user defined
[1] grid or grid system
Default: 0
CellsizeFloating pointTARGET_USER_SIZE-Minimum: 0.000000
Default: 1.000000
WestFloating pointTARGET_USER_XMIN-Default: 0.000000
EastFloating pointTARGET_USER_XMAX-Default: 100.000000
SouthFloating pointTARGET_USER_YMIN-Default: 0.000000
NorthFloating pointTARGET_USER_YMAX-Default: 100.000000
ColumnsIntegerTARGET_USER_COLSNumber of cells in East-West direction.Minimum: 1
Default: 100
RowsIntegerTARGET_USER_ROWSNumber of cells in North-South direction.Minimum: 1
Default: 100
FitChoiceTARGET_USER_FITS-Available Choices:
[0] nodes
[1] cells
Default: 0
Grid SystemGrid systemTARGET_SYSTEM--
(*) optional

Command-line

Usage: saga_cmd grid_calculus 17 [-SCALING <str>] [-MAX_SCALE <double>] [-STEPS <num>] [-RANGE_MIN <double>] [-RANGE_MAX <double>] [-TARGET_DEFINITION <str>] [-TARGET_USER_SIZE <double>] [-TARGET_USER_XMIN <double>] [-TARGET_USER_XMAX <double>] [-TARGET_USER_YMIN <double>] [-TARGET_USER_YMAX <double>] [-TARGET_USER_COLS <num>] [-TARGET_USER_ROWS <num>] [-TARGET_USER_FITS <str>] [-TARGET_TEMPLATE <str>] [-OUT_GRID <str>]
  -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
  -TARGET_DEFINITION:<str>  	Target Grid System
	Choice
	Available Choices:
	[0] user defined
	[1] grid or grid system
	Default: 0
  -TARGET_USER_SIZE:<double>	Cellsize
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -TARGET_USER_XMIN:<double>	West
	Floating point
	Default: 0.000000
  -TARGET_USER_XMAX:<double>	East
	Floating point
	Default: 100.000000
  -TARGET_USER_YMIN:<double>	South
	Floating point
	Default: 0.000000
  -TARGET_USER_YMAX:<double>	North
	Floating point
	Default: 100.000000
  -TARGET_USER_COLS:<num>   	Columns
	Integer
	Minimum: 1
	Default: 100
  -TARGET_USER_ROWS:<num>   	Rows
	Integer
	Minimum: 1
	Default: 100
  -TARGET_USER_FITS:<str>   	Fit
	Choice
	Available Choices:
	[0] nodes
	[1] cells
	Default: 0
  -TARGET_TEMPLATE:<str>    	Target System
	Grid, input, optional, CMD
  -OUT_GRID:<str>           	Fractal Brownian Noise
	Grid, output