landscapemetrics (version 2.1.4)

lsm_l_dcore_sd: 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
)

Value

tibble

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.

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)