Patch richness density (Diversity metric)
lsm_l_prd(landscape, directions)# S3 method for RasterLayer
lsm_l_prd(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_prd(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_prd(landscape, directions = 8)
# S3 method for stars
lsm_l_prd(landscape, directions = 8)
# S3 method for list
lsm_l_prd(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
$$PRD = \frac{m} {A} * 10000 * 100 $$ where \(m\) is the number of classes and \(A\) is the total landscape area in square meters.
PRD is a 'Diversity metric'. It is one of the simplest diversity and composition measures.
In contrast to lsm_l_pr
, it is a relative measure and following, comparable
among landscapes with different total landscape areas.
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
# NOT RUN {
lsm_l_prd(landscape)
# }
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