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(i=1mj=1npiji=1mj=1npijaij)(11Z)1100COHESION = 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 pijp_{ij} is the perimeter in meters, aija_{ij} is the area in square meters and ZZ 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)


[Package landscapemetrics version 2.1.4 Index]