View source: R/lsm_l_core_sd.R
lsm_l_core_sd | R Documentation |
Standard deviation of patch core area (class level)
lsm_l_core_sd(
landscape,
directions = 8,
consider_boundary = FALSE,
edge_depth = 1
)
landscape |
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers. |
directions |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |
consider_boundary |
Logical if cells that only neighbour the landscape boundary should be considered as core |
edge_depth |
Distance (in cells) a cell has the be away from the patch edge to be considered as core cell |
CORE_{SD} = sd(CORE[patch_{ij}])
where CORE[patch_{ij}]
is the core area in square meters of each patch.
CORE_SD is a 'Core area metric'. It equals the standard deviation of the core area 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). The metric describes the differences among all patches in the landscape.
Hectares
CORE_SD >= 0
Equals CORE_SD = 0 if all patches have the same core area. Increases, without limit, as the variation of patch core areas increases.
tibble
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
,
sd
,
lsm_c_core_mn
,
lsm_c_core_sd
,
lsm_c_core_cv
,
lsm_l_core_mn
,
lsm_l_core_cv
lsm_l_core_sd(landscape)
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