Coefficient of variation number of disjunct core areas (Core area metric)
lsm_l_dcore_cv(
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
$$DCORE_{CV} = cv(NCORE[patch_{ij}])$$ where \(NCORE[patch_{ij}]\) is the number of core areas.
DCORE_CV is an 'Core area metric'. It summarises the landscape as the Coefficient of variation of all patches belonging to the landscape. A cell is defined as core if the cell has no neighbour with a different value than itself (rook's case). NCORE counts the disjunct core areas, whereby a core area is a 'patch within the patch' containing only core cells. The metric describes the differences among all patches in the landscape and is easily comparable because it is scaled to the mean.
None
DCORE_CV >= 0
Equals DCORE_CV = 0 if all patches have the same number of disjunct core areas. Increases, without limit, as the variation of number of disjunct core areas increases.
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_ncore,
cv,
lsm_c_dcore_mn,
lsm_c_dcore_sd,
lsm_c_dcore_cv,
lsm_l_dcore_mn,
lsm_l_dcore_sd