landscapemetrics (version 1.4.4)

lsm_l_cohesion: COHESION (landscape level)

Description

Patch Cohesion Index (Aggregation metric)

Usage

lsm_l_cohesion(landscape, directions)

# S3 method for RasterLayer lsm_l_cohesion(landscape, directions = 8)

# S3 method for RasterStack lsm_l_cohesion(landscape, directions = 8)

# S3 method for RasterBrick lsm_l_cohesion(landscape, directions = 8)

# S3 method for stars lsm_l_cohesion(landscape, directions = 8)

# S3 method for list lsm_l_cohesion(landscape, directions = 8)

Arguments

landscape

Raster* Layer, Stack, Brick or a list of rasterLayers.

directions

The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).

Value

tibble

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'.

Units

Percent

Ranges

Unknown

Behaviour

Unknown

References

McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: http://www.umass.edu/landeco/research/fragstats/fragstats.html

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

Run this code
# NOT RUN {
lsm_l_cohesion(landscape)

# }

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