Splitting index (Aggregation metric)
lsm_c_split(landscape, directions = 8)tibble
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers.
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).
$$SPLIT = \frac{A^2} {\sum \limits_{j = 1}^{n} a_{ij}^2}$$ 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.
None
1 <= SPLIT <= Number of cells squared
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
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.
lsm_p_area,
lsm_l_ta,
lsm_l_split