Tool Fragmentation Classes from Density and Connectivity
Fragmentation classes:
(1) interior, if Density = 1.0
(2) undetermined, if Density > 0.6 and Density = Connectivity
(3) perforated, if Density > 0.6 and Density - Connectivity > 0
(4) edge, if Density > 0.6 and Density - Connectivity < 0
(5) transitional, if 0.4 < Density < 0.6
(6) patch, if Density < 0.4
References
- Riitters, K., Wickham, J., O'Neill, R., Jones, B., Smith, E. (2000): Global-scale patterns of forest fragmentation. Conservation Ecology 4(2):3. http://www.ecologyandsociety.org/vol4/iss2/art3/.
- Author: O.Conrad (c) 2008
- Menu: Grid|Analysis|Fragmentation Analysis
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Density [Percent] | Grid (input) | DENSITY | Density Index (Pf). | - |
| Connectivity [Percent] | Grid (input) | CONNECTIVITY | Connectivity Index (Pff). | - | |
| Output | Fragmentation | Grid (output) | FRAGMENTATION | Fragmentation Index | - |
| Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Add Border | Boolean | BORDER | - | Default: 0 | |
| Connectivity Weighting | Floating point | WEIGHT | - | Minimum: 0.000000 Default: 1.100000 | |
| Minimum Density [Percent] | Floating point | DENSITY_MIN | - | Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000 | |
| Minimum Density for Interior Forest [Percent] | Floating point | DENSITY_INT | if less than 100, it is distinguished between interior and core forest | Minimum: 0.000000 Maximum: 100.000000 Default: 99.000000 |
Command-line
Usage: saga_cmd grid_analysis 17 [-DENSITY <str>] [-CONNECTIVITY <str>] [-FRAGMENTATION <str>] [-BORDER <str>] [-WEIGHT <double>] [-DENSITY_MIN <double>] [-DENSITY_INT <double>] -DENSITY:<str> Density [Percent] Grid (input) -CONNECTIVITY:<str> Connectivity [Percent] Grid (input) -FRAGMENTATION:<str> Fragmentation Grid (output) -BORDER:<str> Add Border Boolean Default: 0 -WEIGHT:<double> Connectivity Weighting Floating point Minimum: 0.000000 Default: 1.100000 -DENSITY_MIN:<double> Minimum Density [Percent] Floating point Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000 -DENSITY_INT:<double> Minimum Density for Interior Forest [Percent] Floating point Minimum: 0.000000 Maximum: 100.000000 Default: 99.000000