Mean of core area (Core area metric)
lsm_l_core_mn(
landscape,
directions = 8,
consider_boundary = FALSE,
edge_depth = 1
)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).
Logical if cells that only neighbour the landscape boundary should be considered as core
Distance (in cells) a cell has the be away from the patch edge to be considered as core cell
$$CORE_{MN} = mean(CORE[patch_{ij}])$$ where \(CORE[patch_{ij}]\) is the core area in square meters of each patch.
CORE_MN is a 'Core area metric' and equals the mean of core areas of all patches in the landscape. The core area is defined as all cells that have no neighbour with a different value than themselves (rook's case).
Hectares
CORE_MN >= 0
Equals CORE_MN = 0 if CORE = 0 for all patches. Increases, without limit, as the core area indices increase.
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/
lsm_p_core,
mean,
lsm_c_core_mn,
lsm_c_core_sd,
lsm_c_core_cv,
lsm_l_core_sd,
lsm_l_core_cv