lsm_c_shape_cv: SHAPE_CV (class level)

Description Usage Arguments Details Value References See Also Examples

View source: R/lsm_c_shape_cv.R

Description

Covariance of variation shape index (Shape metric)

Usage

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lsm_c_shape_cv(landscape, directions)

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

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

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

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

## S3 method for class 'list'
lsm_c_shape_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

SHAPE_{CV} = cv(SHAPE[patch_{ij}])

where SHAPE[patch_{ij}] is the shape index of each patch.

SHAPE_CV is a 'Shape metric'. Each class is summarised as the Coefficient of variation of each patch belonging to class i. SHAPE describes the ratio between the actual perimeter of the patch and the hypothetical minimum perimeter of the patch. The minimum perimeter equals the perimeter if the patch would be maximally compact.

Units

None

Range

SHAPE_CV >= 0

Behaviour

Equals SHAPE_CV = 0 if all patches have an identical shape index. Increases, without limit, as the variation of the shape index 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

Patton, D. R. 1975. A diversity index for quantifying habitat "edge". Wildl. Soc.Bull. 3:171-173.

See Also

lsm_p_shape, cv,
lsm_c_shape_mn, lsm_c_shape_sd,
lsm_l_shape_mn, lsm_l_shape_sd, lsm_l_shape_cv

Examples

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r-spatialecology/landscapemetrics documentation built on April 30, 2019, 6:01 a.m.