lsm_l_dcore_sd {landscapemetrics}

DCORE_SD (landscape level)

Description

Standard deviation number of disjunct core areas (Core area metric)

Usage

lsm_l_dcore_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

DCORE_{SD} = sd(NCORE[patch_{ij}])

where NCORE[patch_{ij}] is the number of core areas.

DCORE_SD is an 'Core area metric'. It summarises the landscape as the standard deviation of all patches. A cell is defined as core if the cell has no neighbour with a different value than itself (rook's case). NCORE counts the disjunct core areas, whereby a core area is a 'patch within the patch' containing only core cells. The metric describes the differences among all patches in the landscape.

Units

None

Range

DCORE_SD >= 0

Behaviour

Equals DCORE_SD = 0 if all patches have the same number of disjunct core areas. Increases, without limit, as the variation of number of disjunct 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_ncore, sd
lsm_c_dcore_mn, lsm_c_dcore_sd,
lsm_c_dcore_cv, lsm_l_dcore_mn, lsm_l_dcore_cv

Examples

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