View source: R/lsm_c_dcore_sd.R

lsm_c_dcore_sd | R Documentation |

Standard deviation number of disjunct core areas (Core area metric)

```
lsm_c_dcore_sd(
landscape,
directions = 8,
consider_boundary = FALSE,
edge_depth = 1
)
```

`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 |

`DCORE_{SD} = sd(NCORE[patch_{ij}])`

where `NCORE[patch_{ij}]`

is the number of core areas.

DCORE_SD is an 'Core area metric'. It summarises each class as the standard deviation of all patch areas belonging to class i. A cell is defined as core if the cell has no neighbour with a different value than itself (rook's case). NCORE counts the disjunct core areas, whereby a core area is a 'patch within the patch' containing only core cells. The metric describes the differences among patches of the same class i in the landscape.

None

DCORE_SD >= 0

Equals DCORE_SD = 0 if all patches have the same number of disjunct core areas. Increases, without limit, as the variation of number of disjunct core areas increases.

tibble

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

`lsm_p_ncore`

,
`sd`

`lsm_c_dcore_mn`

,
`lsm_c_dcore_cv`

,

`lsm_l_dcore_mn`

,
`lsm_l_dcore_sd`

,
`lsm_l_dcore_cv`

```
landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_dcore_sd(landscape)
```

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