Description Usage Arguments Details Value References See Also Examples

Mean of 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_c_cai_mn(landscape, directions, consider_boundary, edge_depth)
## S3 method for class 'RasterLayer'
lsm_c_cai_mn(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'RasterStack'
lsm_c_cai_mn(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'RasterBrick'
lsm_c_cai_mn(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'stars'
lsm_c_cai_mn(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'list'
lsm_c_cai_mn(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_{MN} = mean(CAI[patch_{ij}]*

where *CAI[patch_{ij}]* is the core area index of each patch.

CAI_MN is a 'Core area metric'. The metric summarises each class as the mean of the core area index of all patches belonging to class i. The core area index is the percentage of core area in relation to patch area. A cell is defined as core area if the cell has no neighbour with a different value than itself (rook's case).

Percent

CAI_MN >= 0

Equals CAI_MN = 0 if CAI = 0 for all patches. Increases, without limit, as the core area indices increase.

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_cai`

,
`mean`

,

`lsm_c_cai_sd`

,
`lsm_c_cai_cv`

,

`lsm_l_cai_mn`

,
`lsm_l_cai_sd`

,
`lsm_l_cai_cv`

1 |

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