Tool Shannon Index
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. 27,379–423. doi:10.1002/j.1538-7305.1948.tb01338.x.
- Spellerberg, I.F. & Fedor, P.J. (2003): A tribute to Claude Shannon (1916–2001) and a plea for more rigorous use of species richness, species diversity and the 'Shannon-Wiener' Index. Global Ecology and Biogeography 12 (3), p. 177–179. doi:10.1046/j.1466-822X.2003.00015.x..
- 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 | - |
| Shannon Index | Grid (output) | INDEX | - | - |
| Evenness (*) | Grid (optional output) | EVENNESS | - | - |
| 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 22 [-CATEGORIES <str>] [-COUNT <str>] [-INDEX <str>] [-EVENNESS <str>] [-KERNEL_TYPE <str>] [-KERNEL_RADIUS <num>]
-CATEGORIES:<str> Categories
Grid (input)
-COUNT:<str> Number of Categories
Grid (optional output)
-INDEX:<str> Shannon Index
Grid (output)
-EVENNESS:<str> Evenness
Grid (optional output)
-KERNEL_TYPE:<str> Kernel Type
Choice
Available Choices:
[0] Square
[1] Circle
Default: 1
-KERNEL_RADIUS:<num> Radius
Integer
Minimum: 0
Default: 2