Fragmentation Classes from Density and Connectivity
- Author: O.Conrad (c) 2008
- Menu: Grid | Analysis | Fragmentation Analysis
Description
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/.
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 number | WEIGHT | - | Minimum: 0.000000 Default: 1.100000 | |
| Minimum Density [Percent] | floating point number | DENSITY_MIN | - | Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000 | |
| Minimum Density for Interior Forest [Percent] | floating point number | 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] [-CONNECTIVITY ] [-FRAGMENTATION ] [-BORDER ] [-WEIGHT ] [-DENSITY_MIN ] [-DENSITY_INT ] -DENSITY: Density [Percent] grid, input -CONNECTIVITY: Connectivity [Percent] grid, input -FRAGMENTATION: Fragmentation grid, output -BORDER: Add Border boolean Default: 0 -WEIGHT: Connectivity Weighting floating point number Minimum: 0.000000 Default: 1.100000 -DENSITY_MIN: Minimum Density [Percent] floating point number Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000 -DENSITY_INT: Minimum Density for Interior Forest [Percent] floating point number Minimum: 0.000000 Maximum: 100.000000 Default: 99.000000