SAGA 9.4.2 | Tool Library Documentation

Fractal Brownian Noise


Description

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 Systemgrid, 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 point numberMAX_SCALE-Minimum: 0.000000 Default: 1.000000
Stepsinteger numberSTEPS-Minimum: 1 Default: 8
Noise Rangevalue rangeRANGE--
Target Grid SystemchoiceTARGET_DEFINITION-Available Choices: [0] user defined [1] grid or grid system Default: 0
Cellsizefloating point numberTARGET_USER_SIZE-Minimum: 0.000000 Default: 1.000000
Westfloating point numberTARGET_USER_XMIN-Default: 0.000000
Eastfloating point numberTARGET_USER_XMAX-Default: 100.000000
Southfloating point numberTARGET_USER_YMIN-Default: 0.000000
Northfloating point numberTARGET_USER_YMAX-Default: 100.000000
Columnsinteger numberTARGET_USER_COLSNumber of cells in East-West direction.Minimum: 1 Default: 101
Rowsinteger numberTARGET_USER_ROWSNumber of cells in North-South direction.Minimum: 1 Default: 101
FitchoiceTARGET_USER_FITS-Available Choices: [0] nodes [1] cells Default: 0
Grid Systemgrid systemTARGET_SYSTEM--

Command Line


Usage: saga_cmd grid_calculus 17 [-SCALING ] [-MAX_SCALE ] [-STEPS ] [-RANGE_MIN ] [-RANGE_MAX ] [-TARGET_DEFINITION ] [-TARGET_USER_SIZE ] [-TARGET_USER_XMIN ] [-TARGET_USER_XMAX ] [-TARGET_USER_YMIN ] [-TARGET_USER_YMAX ] [-TARGET_USER_COLS ] [-TARGET_USER_ROWS ] [-TARGET_USER_FITS ] [-TARGET_TEMPLATE ] [-OUT_GRID ]
  -SCALING:            	Scaling
	choice
	Available Choices:
	[0] linear
	[1] geometric
	Default: 1
  -MAX_SCALE:       	Maximum Scale
	floating point number
	Minimum: 0.000000
	Default: 1.000000
  -STEPS:              	Steps
	integer number
	Minimum: 1
	Default: 8
  -RANGE_MIN:       	Noise Range
	value range
  -RANGE_MAX:       	Noise Range
	value range
  -TARGET_DEFINITION:  	Target Grid System
	choice
	Available Choices:
	[0] user defined
	[1] grid or grid system
	Default: 0
  -TARGET_USER_SIZE:	Cellsize
	floating point number
	Minimum: 0.000000
	Default: 1.000000
  -TARGET_USER_XMIN:	West
	floating point number
	Default: 0.000000
  -TARGET_USER_XMAX:	East
	floating point number
	Default: 100.000000
  -TARGET_USER_YMIN:	South
	floating point number
	Default: 0.000000
  -TARGET_USER_YMAX:	North
	floating point number
	Default: 100.000000
  -TARGET_USER_COLS:   	Columns
	integer number
	Minimum: 1
	Default: 101
  -TARGET_USER_ROWS:   	Rows
	integer number
	Minimum: 1
	Default: 101
  -TARGET_USER_FITS:   	Fit
	choice
	Available Choices:
	[0] nodes
	[1] cells
	Default: 0
  -TARGET_TEMPLATE:    	Target System
	grid, input, optional, CMD
  -OUT_GRID:           	Fractal Brownian Noise
	grid, output