lsm_p_gyrate: GYRATE (patch level)

Description Usage Arguments Details Value References See Also Examples

Description

Radius of Gyration (Area and edge metric)

Usage

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
lsm_p_gyrate(landscape, directions)

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

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

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

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

## S3 method for class '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).

Details

GYRATE = ∑ \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.

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_c_gyrate_mn, lsm_c_gyrate_sd, lsm_c_gyrate_cv,
lsm_l_gyrate_mn, lsm_l_gyrate_sd, lsm_l_gyrate_cv

Examples

1

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