lsm_l_cohesion: COHESION (landscape level)

In landscapemetrics: Landscape Metrics for Categorical Map Patterns

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)

landscapemetrics documentation built on Sept. 12, 2024, 7:42 a.m.