lsm_p_core: CORE (patch level)

In landscapemetrics: Landscape Metrics for Categorical Map Patterns

CORE (patch level)

Description

Core area (Core area metric)

Usage

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

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.

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_c_core_mn, lsm_c_core_sd, lsm_c_core_cv, lsm_c_tca,
lsm_l_core_mn, lsm_l_core_sd, lsm_l_core_cv, lsm_l_tca

Examples

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

landscapemetrics documentation built on Sept. 12, 2024, 7:42 a.m.