landscapemetrics (version 1.5.6)

lsm_l_dcore_mn: DCORE_MN (landscape level)

Description

Mean number of disjunct core areas (Core area metric)

Usage

lsm_l_dcore_mn(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)

Value

tibble

Arguments

landscape

Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers.

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

$$DCORE_{MN} = mean(NCORE[patch_{ij}])$$ where \(NCORE[patch_{ij}]\) is the number of core areas.

DCORE_MN is an 'Core area metric'. It summarises the landscape as the mean of all patches in the landscape. 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.

Units

None

Range

DCORE_MN > 0

Behaviour

Equals DCORE_MN = 0 if NCORE = 0 for all patches. Increases, without limit, as the number of disjunct core areas increases.

References

McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: https://www.umass.edu/landeco/

See Also

lsm_p_ncore, mean,
lsm_c_dcore_mn, lsm_c_dcore_sd, lsm_c_dcore_cv,
lsm_l_dcore_sd, lsm_l_dcore_cv

Examples

lsm_l_dcore_mn(landscape)