| Name | Abbreviation | Level | Unit |
|---|---|---|---|
| Patch area | AREA | class | cell surfaces |
| Mean patch area | AREA_MN | class | cell surfaces |
| Total class area | CA | class | cell surfaces |
| Proportion of landscape | PLAND / NON_FOCAL_PLAND | class | percentage |
| Number of patches | NP | class | unitless |
| Patch density | PD | class | patches per cell surface |
| Smallest patch index | SPI | class | cell surfaces |
| Largest patch index | LPI | class | cell surfaces |
| Effective mesh size | MESH | class | cell surfaces |
| Splitting index | SPLI | class | unitless |
| Net product | NPRO | class | (cell surfaces)^2 |
| Splitting density | SDEN | class | (cell surfaces)^-1 |
| Degree of coherence | COHE | class | probability (in [0, 1]) |
| Degree of landscape division | DIVI | class | probability (in [0, 1]) |
| Force square patches | IS_SQUARE | class | true of false |
| Force different areas | ALL_DIFFERENT | class | true of false |
Interval that defines the minimum and maximum allowed area for all patches of the landscape class.
Interval that defines the minimum and maximum allowed mean patch area for the landscape class.
Interval that defines the minimum and maximum allowed total area of the landscape class.
Interval that defines the minimum and maximum allowed proportion of
landscape occupied by the landscape class. NON_FOCAL_PLAND
is used to enforce a PLAND target on the non-focal class, and is defined
at the landscape level.
Interval that defines the minimum and maximum allowed number of patches in the landscape class.
Interval that defines the minimum and maximum allowed patch density of the landscape class. Patch density is given by:
\[PD = \frac{NP}{L}\]
With NP the number of patches and L the landscape area.
Interval that defines the minimum and maximum allowed size for the smallest patch of the landscape class.
Interval that defines the minimum and maximum allowed size for the largest patch of the landscape class.
Interval that defines the minimum and maximum allowed effective mesh size. The effective mesh size is a fragmentation index based on the probability that two points that are randomly chosen are located in the main patch (Jaeger, 2000). It is given by:
\[MESH = \frac{1}{L} \sum_{i=1}^{NP} A_i^2\] With L the total landscape area, NP the number of patches in the landscape class, and \(A_i\) the area of patch \(i\).
Interval that defines the minimum and maximum allowed splitting index. The splitting index was defined by Jaeger (2000) and is given by:
\[ SPLI = \frac{L^2}{\sum_{i=1}^{NP} A_i^2} \]
With L the total landscape area, NP the number of patches, and \(A_i\) the area of patch i.
Interval that defines the minimum and maximum allowed net product. The net product was defined by Jaeger (2000) and is given by:
\[ NPRO = \sum_{i=1}^{NP} A_i^2 \] Where NP is the number of patches of the landscape class and \(A_i\) the area of patch i.
Interval that defines the minimum and maximum allowed splitting density. The splitting density was defined by Jaeger (2000) and is given by:
\[ SDEN = \frac{L}{\sum_{i=1}^{NP} A_i^2} \]
With L the total landscape area, NP the number of patches, and \(A_i\) the area of patch i.
Interval that defines the minimum and maximum allowed degree of coherence. The degree of coherence was defined by Jaeger (2000) and is given by:
\[ COHE = \sum_{i=1}^{NP}(\frac{A_i}{L})^2 \] With L the total landscape area, NP the number of patches, and \(A_i\) the area of patch i.
Interval that defines the minimum and maximum allowed degree of landscape division. The degree of landscape division was defined by Jaeger (2000) and is given by:
\[ DIVI = 1 - \sum_{i=1}^{NP}(\frac{A_i}{L})^2 \]
With L the total landscape area, NP the number of patches, and \(A_i\) the area of patch i.
This target forces rflsgen to produce only patches that areperfect squares. Note that this restricts the range of possible areas, as patches areas must be in the form \(A_i = w * w\), where \(w\) is the width of a perfect square.
This target forces rflsgen to produce patches that all have a different area.
References
Jaeger, J. A. G. (2000). Landscape division, splitting index, and effective mesh size: New measures of landscape fragmentation. Landscape Ecology, 15(2), 115-130. https://doi.org/10.1023/A:1008129329289