View source: R/lsm_c_para_sd.R

lsm_c_para_sd | R Documentation |

Standard deviation perimeter-area ratio (Shape metric)

```
lsm_c_para_sd(landscape, directions = 8)
```

`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). |

`PARA_{SD} = sd(PARA[patch_{ij}]`

where `PARA[patch_{ij}]`

is the perimeter area ratio of each patch.

PARA_SD is a 'Shape metric'. It summarises each class as the standard deviation of each patch belonging to class i. The perimeter-area ratio describes the patch complexity in a straightforward way. However, because it is not standarised to a certain shape (e.g. a square), it is not scale independent, meaning that increasing the patch size while not changing the patch form will change the ratio.

None

PARA_SD >= 0

Equals PARA_SD = 0 if the perimeter-area ratio is identical for all patches. Increases, without limit, as the variation of the perimeter-area ratio 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_para`

,
`sd`

,

`lsm_c_para_mn`

,
`lsm_c_para_cv`

,

`lsm_l_para_mn`

,
`lsm_l_para_sd`

,
`lsm_l_para_cv`

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

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