Description Usage Arguments Details Value References See Also Examples

Fractal dimension index (Shape metric)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ```
lsm_p_frac(landscape, directions)
## S3 method for class 'RasterLayer'
lsm_p_frac(landscape, directions = 8)
## S3 method for class 'RasterStack'
lsm_p_frac(landscape, directions = 8)
## S3 method for class 'RasterBrick'
lsm_p_frac(landscape, directions = 8)
## S3 method for class 'stars'
lsm_p_frac(landscape, directions = 8)
## S3 method for class 'list'
lsm_p_frac(landscape, directions = 8)
``` |

`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). |

*FRAC = \frac{2 * \ln * (0.25 * p_{ij})} {\ln a_{ij}}*

where *p_{ij}* is the perimeter in meters and *a_{ij}* is the
area in square meters

FRAC is a 'Shape metric'. The index is based on the patch perimeter and the patch area and describes the patch complexity. Because it is standardized, it is scale independent, meaning that increasing the patch size while not changing the patch form will not change the ratio.

None

1 <= FRAC <= 2

Approaches FRAC = 1 for a squared patch shape form and FRAC = 2 for a irregular patch shape.

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

Mandelbrot, B. B. 1977. Fractals: Form, Chance, and Dimension. San Francisco. W. H. Freeman and Company.

`lsm_p_area`

,
`lsm_p_perim`

,

`lsm_c_frac_mn`

,
`lsm_c_frac_sd`

,
`lsm_c_frac_cv`

,

`lsm_l_frac_mn`

,
`lsm_l_frac_sd`

,
`lsm_l_frac_cv`

1 |

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