lsm_c_gyrate_sd: GYRATE_SD (class level)

Description Usage Arguments Details Value References See Also Examples

View source: R/lsm_c_gyrate_sd.R

Description

Standard deviation radius of gyration (Area and edge metric)

Usage

1
lsm_c_gyrate_sd(landscape, directions = 8, cell_center = FALSE)

Arguments

landscape

Raster* Layer, Stack, Brick, SpatRaster (terra), stars, 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).

cell_center

If true, the coordinates of the centroid are forced to be a cell center within the patch.

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 each class as the standard deviation 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.

If cell_center = TRUE some patches might have several possible cell-center centroids. In this case, the gyrate index is based on the mean distance of all cells to all possible cell-center centroids.

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_cv,
lsm_l_gyrate_mn, lsm_l_gyrate_sd, lsm_l_gyrate_cv

Examples

1

landscapemetrics documentation built on July 6, 2021, 5:06 p.m.