Splitting index (Aggregation metric)
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)
Raster* Layer, Stack, Brick or a list of rasterLayers.
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).
tibble
$$SSPLIT = \frac{A^2} {\sum \limits_{i = 1}^{m} \sum \limits_{j = 1}^{n} a_{ij}^2}$$ 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.
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.
# NOT RUN {
lsm_l_split(landscape)
# }
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