landscapemetrics (version 1.4.4)

lsm_l_split: SPLIT (landscape level)

Description

Splitting index (Aggregation metric)

Usage

lsm_l_split(landscape, directions)
# S3 method for RasterLayer
lsm_l_split(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_split(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_split(landscape, directions = 8)
# S3 method for stars
lsm_l_split(landscape, directions = 8)
# S3 method for list
lsm_l_split(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

$$SSPLIT = \frac{A^2} {\sum \limits_{i = 1}^{m} \sum \limits_{j = 1}^{n} a_{ij}^2}$$ where \(a_{ij}\) is the patch area in square meters and \(A\) is the total landscape area.

SPLIT is an 'Aggregation metric'. It describes the number of patches if all patches the landscape would be divided into equally sized patches.

Units

None

Range

1 <= SPLIT <= Number of cells squared

Behaviour

Equals SPLIT = 1 if only one patch is present. Increases as the number of patches increases and is limited if all cells are a patch

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

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_c_split

Examples

# NOT RUN {
lsm_l_split(landscape)

# }