landscapemetrics (version 1.4.4)

lsm_p_gyrate: GYRATE (patch level)

Description

Radius of Gyration (Area and edge metric)

Usage

lsm_p_gyrate(landscape, directions)
# S3 method for RasterLayer
lsm_p_gyrate(landscape, directions = 8)
# S3 method for RasterStack
lsm_p_gyrate(landscape, directions = 8)
# S3 method for RasterBrick
lsm_p_gyrate(landscape, directions = 8)
# S3 method for stars
lsm_p_gyrate(landscape, directions = 8)
# S3 method for list
lsm_p_gyrate(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).

Value

tibble

Details

$$GYRATE = \sum \limits_{r = 1}^{z} \frac{h_{ijr}} {z}$$ where \(h_{ijr}\) is the distance from each cell to the centroid of the patch and \(z\) is the number of cells.

GYRATE is an 'Area and edge metric'. The distance from each cell to the patch centroid is based on cell center-to-cell center distances. The metrics characterises both the patch area and compactness.

Units

Meters

Range

GYRATE >= 0

Behaviour

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

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_c_gyrate_mn, lsm_c_gyrate_sd, lsm_c_gyrate_cv, lsm_l_gyrate_mn, lsm_l_gyrate_sd, lsm_l_gyrate_cv

Examples

# NOT RUN {
lsm_p_gyrate(landscape)

# }