Percentage of Like Adjacencies (Aggregation metric)
lsm_c_pladj(landscape)
Arguments
landscape: A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.
Returns
tibble
Details
PLADJ=(k=1∑mgikgij)∗100
where gii is the number of adjacencies between cells of class i and gik is the number of adjacencies between cells of class i and k.
PLADJ is an 'Aggregation metric'. It calculates the frequency how often patches of different classes i (focal class) and k are next to each other, and following is a measure of class aggregation. The adjacencies are counted using the double-count method.
Units
Percent
Ranges
0 <= PLADJ <= 100
Behaviour
Equals PLADJ = 0 if class i is maximal disaggregated, i.e. every cell is a different patch. Equals PLADJ = 100 when the only one patch is present.
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.