Tool Name	Shannon Index
Tool ID	22
Library ID	grid_analysis
Version	1.0
Author(s)	O.Conrad (c) 2019

Description

Grid based analysis of diversity with the Shannon 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

Pielou, E.C. (1969): An Introduction to Mathematical Ecology. John Wiley, New York.

Shannon, C. (1948): A mathematical theory of communication. Bell Syst. Tech. J. 27,379â€“423. doi:10.1002/j.1538-7305.1948.tb01338.x

Spellerberg, I.F. & Fedor, P.J. (2003): A tribute to Claude Shannon (1916â€“2001) and a plea for more rigorous use of species richness, species diversity and the 'Shannon-Wiener' Index. Global Ecology and Biogeography 12 (3), p. 177â€“179. doi:10.1046/j.1466-822X.2003.00015.x.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Categories	grid, input	CATEGORIES
Output
Number of Categories	grid, output, optional	COUNT	number of different categories (unique values) within search area
Shannon Index	grid, output	INDEX
Evenness	grid, output, optional	EVENNESS
Options
Kernel Type	choice	KERNEL_TYPE	The kernel's shape.	Available Choices: [0] Square [1] Circle Default: 1
Radius	integer number	KERNEL_RADIUS	cells	Minimum: 0 Default: 2