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`	-	-
Input	Reference Grid	Grid, input	`REFERENCE`	-	-
Output	Adjusted Grid (*)	Grid, output, optional	`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, output, optional
  -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