lsm_c_frac_cv: FRAC_CV (class level)

Description Usage Arguments Details Value References See Also Examples

Description

Coefficient of variation fractal dimension index (Shape metric)

Usage

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lsm_c_frac_cv(landscape, directions)

## S3 method for class 'RasterLayer'
lsm_c_frac_cv(landscape, directions = 8)

## S3 method for class 'RasterStack'
lsm_c_frac_cv(landscape, directions = 8)

## S3 method for class 'RasterBrick'
lsm_c_frac_cv(landscape, directions = 8)

## S3 method for class 'stars'
lsm_c_frac_cv(landscape, directions = 8)

## S3 method for class 'list'
lsm_c_frac_cv(landscape, directions = 8)

Arguments

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).

Details

FRAC_{CV} = cv(FRAC[patch_{ij}])

where FRAC[patch_{ij}] equals the fractal dimension index of each patch.

FRAC_CV is a 'Shape metric'. The metric summarises each class as the Coefficient of variation of the fractal dimension index of all patches belonging to class i. The fractal dimension index is based on the patch perimeter and the patch area and describes the patch complexity. The Coefficient of variation is scaled to the mean and comparable among different landscapes.

Units

None

Range

FRAC_CV >= 0

Behaviour

Equals FRAC_CV = 0 if the fractal dimension index is identical for all patches. Increases, without limit, as the variation of the fractal dimension indices increases.

Value

tibble

References

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.

See Also

lsm_p_frac, cv,
lsm_c_frac_mn, lsm_c_frac_sd,
lsm_l_frac_mn, lsm_l_frac_sd, lsm_l_frac_cv

Examples

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