lsm_l_core_mn() R function from [landscapemetrics]

CORE_MN (landscape level)

Mean of core area (Core area metric)


lsm_l_core_mn(
  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_{MN} = mean(CORE[patch_{ij}])

where $CORE[patch_{ij}]$ is the core area in square meters of each patch.

CORE_MN is a 'Core area metric' and equals the mean of core areas 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).

Because the metric is based on distances or areas please make sure your data is valid using check_landscape.

Units

Hectares

Range

CORE_MN >= 0

Behaviour

Equals CORE_MN = 0 if CORE = 0 for all patches. Increases, without limit, as the core area indices increase.

Examples


landscape <- terra::rast(landscapemetrics::landscape)
lsm_l_core_mn(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_l_core_mn function