Core area (Core area metric)
lsm_p_core(
landscape,
directions = 8,
consider_boundary = FALSE,
edge_depth = 1
)tibble
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.
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
$$CORE = a_{ij}^{core}$$ where \(a_{ij}^{core}\) is the core area in square meters
CORE is a 'Core area metric' and equals the area within a patch that is not on the edge of it. A cell is defined as core area if the cell has no neighbour with a different value than itself (rook's case). It describes patch area and shape simultaneously (more core area when the patch is large and the shape is rather compact, i.e. a square).
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape.
Hectares
CORE >= 0
Increases, without limit, as the patch area increases and the patch shape simplifies (more core area). CORE = 0 when every cell in the patch is an edge.
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
lsm_c_core_mn,
lsm_c_core_sd,
lsm_c_core_cv,
lsm_c_tca,
lsm_l_core_mn,
lsm_l_core_sd,
lsm_l_core_cv,
lsm_l_tca
landscape <- terra::rast(landscapemetrics::landscape)
lsm_p_core(landscape)
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