landscapemetrics (version 1.4.4)

lsm_p_core: CORE (patch level)

Description

Core area (Core area metric)

Usage

lsm_p_core(landscape, directions, consider_boundary, edge_depth)
# S3 method for RasterLayer
lsm_p_core(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)
# S3 method for RasterStack
lsm_p_core(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)
# S3 method for RasterBrick
lsm_p_core(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)
# S3 method for stars
lsm_p_core(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)
# S3 method for list
lsm_p_core(
  landscape,
  directions = 8,
  consider_boundary = FALSE,
  edge_depth = 1
)

Arguments

landscape

Raster* Layer, Stack, Brick 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

Value

tibble

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).

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.

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: http://www.umass.edu/landeco/research/fragstats/fragstats.html

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

# NOT RUN {
lsm_p_core(landscape)

# }