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.
- Author: A.Jack, O.Conrad (c) 2017
- Menu: Grid|Calculus|Grid Generation
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Target System (*) | Grid (optional input) | TEMPLATE | use this grid's system for output grids | - |
| Output | Fractal Brownian Noise | Grid (output) | OUT_GRID | - | - |
| Options | Target Grid System | Choice | DEFINITION | - | Available Choices:
[0] user defined
[1] grid or grid system
Default: 0 |
| Cellsize | Floating point | USER_SIZE | - | Minimum: 0.000000
Default: 1.000000 |
| Left | Floating point | USER_XMIN | - | Default: 0.000000 |
| Right | Floating point | USER_XMAX | - | Default: 100.000000 |
| Bottom | Floating point | USER_YMIN | - | Default: 0.000000 |
| Top | Floating point | USER_YMAX | - | Default: 100.000000 |
| Fit | Choice | USER_FITS | - | Available Choices:
[0] nodes
[1] cells
Default: 0 |
| Grid System | Grid system | SYSTEM | - | - |
| Scaling | Choice | SCALING | - | Available Choices:
[0] linear
[1] geometric
Default: 1 |
| Maximum Scale | Floating point | MAX_SCALE | - | Minimum: 0.000000
Default: 1.000000 |
| Steps | Integer | STEPS | - | Minimum: 0
Default: 8 |
| Noise Range | Value range | RANGE | - | - |
| (*) 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: 0
Default: 8
-RANGE_MIN:<double> Noise Range
Value range
-RANGE_MAX:<double> Noise Range
Value range