Tool Histogram Matching
This tool alters the values of a grid so that its value distribution (its histogram), matches that of a reference grid. The first method simply uses arithmetic mean and standard deviation for adjustment, which usually is sufficient for normal distributed values. The second method performs a more precise adjustment based on the grids' histograms.
- Author: O.Conrad (c) 2019
- Menu: Grid|Calculus|Transformations
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Grid | Grid (input) | GRID | - | - |
| Reference Grid | Grid (input) | REFERENCE | - | - |
| Output | Adjusted Grid (*) | Grid (optional output) | MATCHED | - | - |
| Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Grid system | Grid system | REFERENCE_GRIDSYSTEM | - | - |
| Method | Choice | METHOD | - | Available Choices:
[0] standard deviation
[1] histogram
Default: 1 |
| Histogramm Classes | Integer | NCLASSES | Number of histogram classes for internal use. | Minimum: 100
Default: 10 |
| Maximum Sample Size | Integer | MAXSAMPLES | If set to zero all data will be used to build the histograms. | Minimum: 0
Default: 1000000 |
| (*) optional |
Command-line
Usage: saga_cmd grid_calculus 21 [-GRID <str>] [-MATCHED <str>] [-REFERENCE <str>] [-METHOD <str>] [-NCLASSES <num>] [-MAXSAMPLES <num>]
-GRID:<str> Grid
Grid (input)
-MATCHED:<str> Adjusted Grid
Grid (optional output)
-REFERENCE:<str> Reference Grid
Grid (input)
-METHOD:<str> Method
Choice
Available Choices:
[0] standard deviation
[1] histogram
Default: 1
-NCLASSES:<num> Histogramm Classes
Integer
Minimum: 100
Default: 10
-MAXSAMPLES:<num> Maximum Sample Size
Integer
Minimum: 0
Default: 1000000