lsm_l_shape_mn: SHAPE_MN (landscape level)

Description Usage Arguments Details Value References See Also Examples

Description

Mean shape index (Shape metric)

Usage

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lsm_l_shape_mn(landscape, directions)

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

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

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

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

## S3 method for class 'list'
lsm_l_shape_mn(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_{MN} = mean(SHAPE[patch_{ij}])

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

SHAPE_MN is a 'Shape metric'. The landscape is summarised as the mean of all patches in the landscape. 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_SD >= 1

Behaviour

Equals SHAPE_MN = 0 if all patches are squares. Increases, without limit, as the shapes of patches become more complex.

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, mean,
lsm_c_shape_mn, lsm_c_shape_sd, lsm_c_shape_cv,
lsm_l_shape_sd, lsm_l_shape_cv

Examples

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