lsm_l_gyrate_sd: GYRATE_SD (landscape level)

Description Usage Arguments Details Value References See Also Examples

Description

Standard deviation 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_l_gyrate_sd(landscape, directions)

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

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

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

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

## S3 method for class 'list'
lsm_l_gyrate_sd(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_{SD} = sd(GYRATE[patch_{ij}])

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

GYRATE_SD is an 'Area and edge metric'. The metric summarises the landscape as the standard deviation of the radius of gyration of all patches in the landscape. 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.

Units

Meters

Range

GYRATE_SD >= 0

Behaviour

Equals GYRATE_SD = 0 if the radius of gyration is identical for all patches. Increases, without limit, as the variation of the radius of gyration 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

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, cv,
lsm_c_gyrate_mn, lsm_c_gyrate_sd, lsm_c_gyrate_cv,
lsm_l_gyrate_mn, lsm_l_gyrate_cv

Examples

1

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