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, output, optional | COUNT | number of different categories (unique values) within search area | - |
| 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, output, optional -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