Description Usage Arguments Details Value References See Also Examples

Core area index (Core area metric)

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

`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 |

*CAI = (\frac{a_{ij}^{core}} {a_{ij}}) * 100*

where *a_{ij}^{core}* is the core area in square meters and *a_{ij}*
is the area in square meters.

CAI is a 'Core area metric'. It equals the percentage of a patch that is core area. 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 index is relative, it is comparable among patches with different area.

Percent

0 <= CAI <= 100

CAI = 0 when the patch has no core area and approaches CAI = 100 with increasing percentage of core area within a patch.

tibble

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_p_core`

,
`lsm_p_area`

,

`lsm_c_cai_mn`

,
`lsm_c_cai_sd`

,
`lsm_c_cai_cv`

,
`lsm_c_cpland`

,

`lsm_l_cai_mn`

,
`lsm_l_cai_sd`

,
`lsm_l_cai_cv`

1 |

r-spatialecology/landscapemetrics documentation built on May 20, 2019, noon

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