lsm_c_division: DIVISION (class level)

View source: R/lsm_c_division.R

lsm_c_divisionR Documentation

DIVISION (class level)

Description

Landscape division index (Aggregation metric)

Usage

lsm_c_division(landscape, directions = 8)

Arguments

landscape

Raster* Layer, Stack, Brick, SpatRaster (terra), stars, 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).

Details

DIVISON = (1 - ∑ \limits_{j = 1}^{n} (\frac{a_{ij}} {A}) ^ 2)

where a_{ij} is the area in square meters and A is the total landscape area in square meters.

DIVISION is an 'Aggregation metric. It can be in as the probability that two randomly selected cells are not located in the same patch of class i. The landscape division index is negatively correlated with the effective mesh size (lsm_c_mesh).

Units

Proportion

Ranges

0 <= Division < 1

Behaviour

Equals DIVISION = 0 if only one patch is present. Approaches DIVISION = 1 if all patches of class i are single cells.

Value

tibble

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: https://www.umass.edu/landeco/

Jaeger, J. A. 2000. Landscape division, splitting index, and effective mesh size: new measures of landscape fragmentation. Landscape ecology, 15(2), 115-130.

See Also

lsm_p_area, lsm_l_ta,
lsm_l_division

Examples

lsm_c_division(landscape)


landscapemetrics documentation built on Nov. 1, 2022, 1:07 a.m.