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, input, optional, CMD | TARGET_TEMPLATE | use this grid's system for output grids | - |
| Output | Fractal Brownian Noise | Grid, output | OUT_GRID | - | - |
| Options | 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: 1
Default: 8 |
| Noise Range | Value range | RANGE | - | - |
| Target Grid System | Choice | TARGET_DEFINITION | - | Available Choices:
[0] user defined
[1] grid or grid system
Default: 0 |
| Cellsize | Floating point | TARGET_USER_SIZE | - | Minimum: 0.000000
Default: 1.000000 |
| West | Floating point | TARGET_USER_XMIN | - | Default: 0.000000 |
| East | Floating point | TARGET_USER_XMAX | - | Default: 100.000000 |
| South | Floating point | TARGET_USER_YMIN | - | Default: 0.000000 |
| North | Floating point | TARGET_USER_YMAX | - | Default: 100.000000 |
| Columns | Integer | TARGET_USER_COLS | Number of cells in East-West direction. | Minimum: 1
Default: 101 |
| Rows | Integer | TARGET_USER_ROWS | Number of cells in North-South direction. | Minimum: 1
Default: 101 |
| Fit | Choice | TARGET_USER_FITS | - | Available Choices:
[0] nodes
[1] cells
Default: 0 |
| Grid System | Grid system | TARGET_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: 101
-TARGET_USER_ROWS:<num> Rows
Integer
Minimum: 1
Default: 101
-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