lsm_p_core() R function from [landscapemetrics]

CORE (patch level)

Core area (Core area metric)


lsm_p_core(
  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

Returns

tibble

Details

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.

Units

Hectares

Range

CORE >= 0

Behaviour

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.

Examples


landscape <- terra::rast(landscapemetrics::landscape)
lsm_p_core(landscape)

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

lsm_p_core function