| lsm_l_cohesion {landscapemetrics} | R Documentation |
COHESION (landscape level)
Description
Patch Cohesion Index (Aggregation metric)
Usage
lsm_l_cohesion(landscape, directions = 8)
Arguments
landscape |
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters. |
directions |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |
Details
COHESION = 1 - (\frac{\sum \limits_{i = 1}^{m} \sum \limits_{j = 1}^{n} p_{ij}} {\sum \limits_{i = 1}^{m} \sum \limits_{j = 1}^{n} p_{ij} \sqrt{a_{ij}}}) * (1 - \frac{1} {\sqrt{Z}}) ^ {-1} * 100
where p_{ij} is the perimeter in meters, a_{ij} is the area in square
meters and Z is the number of cells.
COHESION is an 'Aggregation metric'.
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape.
Units
Percent
Ranges
Unknown
Behaviour
Unknown
Value
tibble
References
McGarigal K., SA Cushman, and E Ene. 2023. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical Maps. Computer software program produced by the authors; available at the following web site: https://www.fragstats.org
Schumaker, N. H. 1996. Using landscape indices to predict habitat connectivity. Ecology, 77(4), 1210-1225.
See Also
lsm_p_perim,
lsm_p_area,
lsm_l_cohesion
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_l_cohesion(landscape)