Description Usage Arguments Details Value References See Also Examples

Standard deviation number of disjunct core areas (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_l_dcore_sd(landscape, directions, consider_boundary, edge_depth)
## S3 method for class 'RasterLayer'
lsm_l_dcore_sd(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'RasterStack'
lsm_l_dcore_sd(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'RasterBrick'
lsm_l_dcore_sd(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'stars'
lsm_l_dcore_sd(landscape, directions = 8,
consider_boundary = FALSE, edge_depth = 1)
## S3 method for class 'list'
lsm_l_dcore_sd(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 |

*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 the landscape as the standard deviation of all patches. 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 all patches 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. 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_ncore`

,
`sd`

,

`lsm_c_dcore_mn`

,
`lsm_c_dcore_sd`

,

`lsm_c_dcore_cv`

,
`lsm_l_dcore_mn`

,
`lsm_l_dcore_cv`

1 |

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

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