lsm_c_split() R function from [landscapemetrics]

SPLIT (class level)

Splitting index (Aggregation metric)


lsm_c_split(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).

Returns

tibble

Details

SPLIT = \frac{A^2} {\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 of class i would be divided into equally sized patches.

Because the metric is based on distances or areas please make sure your data is valid using check_landscape.

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 of class i increases and is limited if all cells are a patch

Examples


landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_split(landscape)

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

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

lsm_c_split function