lsm_c_core_sd {landscapemetrics} | R Documentation |
CORE_SD (class level)
Description
Standard deviation patch core area (class level)
Usage
lsm_c_core_sd(
landscape,
directions = 8,
consider_boundary = FALSE,
edge_depth = 1
)
Arguments
landscape |
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters. |
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 |
Details
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 each patch belonging to class i. 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 patches of the same class i in the landscape.
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape
.
Units
Hectares
Range
CORE_SD >= 0
Behaviour
Equals CORE_SD = 0 if all patches have the same core area. Increases, without limit, as the variation of patch core areas increases.
Value
tibble
References
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
See Also
lsm_p_core
,
sd
lsm_c_core_mn
,
lsm_c_core_cv
,
lsm_l_core_mn
,
lsm_l_core_sd
,
lsm_l_core_cv
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_core_sd(landscape)