Module Fragmentation Classes from Density and Connectivity
(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: (c) 2008 by O.Conrad
- 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 | 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