Tool Simpson Index

Grid based analysis of diversity with the Simpson Index. The index is calculated locally for each grid cell using the specified kernel (aka 'moving window'). It is assumed that the grid cell values represent a classification.

References

Simpson, E.H. (1949): Measurement of diversity. Nature, 163:688. doi:10.1038/163688a0..

Author: O.Conrad (c) 2019
Menu: Grid|Analysis|Diversity

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Categories	Grid (input)	`CATEGORIES`	-	-
Output	Number of Categories (*)	Grid (optional output)	`COUNT`	number of different categories (unique values) within search area	-
Output	Simpson Index	Grid (output)	`INDEX`	-	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Kernel Type	Choice	`KERNEL_TYPE`	The kernel's shape.	Available Choices: [0] Square [1] Circle Default: 1
	Radius	Integer	`KERNEL_RADIUS`	cells	Minimum: 0 Default: 2
(*) optional

Command-line

Usage: saga_cmd grid_analysis 23 [-CATEGORIES <str>] [-COUNT <str>] [-INDEX <str>] [-KERNEL_TYPE <str>] [-KERNEL_RADIUS <num>]
  -CATEGORIES:<str>   	Categories
	Grid (input)
  -COUNT:<str>        	Number of Categories
	Grid (optional output)
  -INDEX:<str>        	Simpson Index
	Grid (output)
  -KERNEL_TYPE:<str>  	Kernel Type
	Choice
	Available Choices:
	[0] Square
	[1] Circle
	Default: 1
  -KERNEL_RADIUS:<num>	Radius
	Integer
	Minimum: 0
	Default: 2