# lsm_p_core: CORE (patch level) In r-spatialecology/landscapemetrics: Landscape Metrics for Categorical Map Patterns

## Description

Core area (Core area metric)

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21``` ```lsm_p_core(landscape, directions, consider_boundary, edge_depth) ## S3 method for class 'RasterLayer' lsm_p_core(landscape, directions = 8, consider_boundary = FALSE, edge_depth = 1) ## S3 method for class 'RasterStack' lsm_p_core(landscape, directions = 8, consider_boundary = FALSE, edge_depth = 1) ## S3 method for class 'RasterBrick' lsm_p_core(landscape, directions = 8, consider_boundary = FALSE, edge_depth = 1) ## S3 method for class 'stars' lsm_p_core(landscape, directions = 8, consider_boundary = FALSE, edge_depth = 1) ## S3 method for class '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

## 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).

Hectares

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.

tibble

## 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

`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`
 `1` ```lsm_p_core(landscape) ```