lsm_c_gyrate_mn: GYRATE_MN (class level)

Description Usage Arguments Details Value References See Also Examples

Description

Mean radius of gyration (Area and edge metric)

Usage

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lsm_c_gyrate_mn(landscape, directions)

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

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

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

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

## S3 method for class 'list'
lsm_c_gyrate_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

GYRATE_{MN} = mean(GYRATE[patch_{ij}])

where GYRATE[patch_{ij}] equals the radius of gyration of each patch.

GYRATE_MN is an 'Area and edge metric'. The metric summarises each class as the mean of the radius of gyration of all patches belonging to class i. GYRATE measures the distance from each cell to the patch centroid and is based on cell center-to-cell center distances. The metrics characterises both the patch area and compactness. The Coefficient of variation is scaled to the mean and comparable among different landscapes.

Units

Meters

Range

GYRATE_MN >= 0

Behaviour

Approaches GYRATE_MN = 0 if every patch is a single cell. Increases, without limit, when only one patch is present.

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

Keitt, T. H., Urban, D. L., & Milne, B. T. 1997. Detecting critical scales in fragmented landscapes. Conservation ecology, 1(1).

See Also

lsm_p_gyrate, mean,
lsm_c_gyrate_sd, lsm_c_gyrate_cv,
lsm_l_gyrate_mn, lsm_l_gyrate_sd, lsm_l_gyrate_cv

Examples

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