Fragmentation (Alternative)
- Author: O.Conrad (c) 2008
- Menu: Grid | Analysis | Fragmentation Analysis
Description
(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.https://www.srs.fs.usda.gov/pubs/ja/ja_riitters006.pdf
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Classification | grid, input | CLASSES | - | - |
| Output | Density [Percent] | grid, output | DENSITY | Density Index (Pf). | - |
| Connectivity [Percent] | grid, output | CONNECTIVITY | Connectivity Index (Pff). | - |
| Fragmentation | grid, output | FRAGMENTATION | Fragmentation Index | - |
| Summary | table, output, optional | FRAGSTATS | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Class Identifier | integer number | CLASS | - | Default: 1 |
| Neighborhood | value range | NEIGHBORHOOD | Moving window size = 1 + 2 * Neighborhood. | - |
| Level Aggregation | choice | AGGREGATION | - | Available Choices:
[0] average
[1] multiplicative
Default: 0 |
| 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 |
| Search Distance Increment | floating point number | LEVEL_GROW | - | Minimum: 0.000000
Default: 1.000000 |
| Density from Neighbourhood | boolean | DENSITY_MEAN | - | Default: 1 |
Command Line
Usage: saga_cmd grid_analysis 16 [-CLASSES ] [-DENSITY ] [-CONNECTIVITY ] [-FRAGMENTATION ] [-FRAGSTATS ] [-CLASS ] [-NEIGHBORHOOD_MIN ] [-NEIGHBORHOOD_MAX ] [-AGGREGATION ] [-BORDER ] [-WEIGHT ] [-DENSITY_MIN ] [-DENSITY_INT ] [-LEVEL_GROW ] [-DENSITY_MEAN ]
-CLASSES: Classification
grid, input
-DENSITY: Density [Percent]
grid, output
-CONNECTIVITY: Connectivity [Percent]
grid, output
-FRAGMENTATION: Fragmentation
grid, output
-FRAGSTATS: Summary
table, output, optional
-CLASS: Class Identifier
integer number
Default: 1
-NEIGHBORHOOD_MIN: Neighborhood
value range
-NEIGHBORHOOD_MAX: Neighborhood
value range
-AGGREGATION: Level Aggregation
choice
Available Choices:
[0] average
[1] multiplicative
Default: 0
-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
-LEVEL_GROW: Search Distance Increment
floating point number
Minimum: 0.000000
Default: 1.000000
-DENSITY_MEAN: Density from Neighbourhood
boolean
Default: 1