landscapemetrics (version 1.4.4)

lsm_c_shape_sd: SHAPE_SD (class level)

Description

Standard deviation shape index (Shape metric)

Usage

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

Value

tibble

Details

$$SHAPE_{SD} = sd(SHAPE[patch_{ij}])$$ where \(SHAPE[patch_{ij}]\) is the shape index of each patch.

SHAPE_SD is a 'Shape metric'. Each class is summarised as the standard deviation of each patch belonging to class i. SHAPE describes the ratio between the actual perimeter of the patch and the hypothetical minimum perimeter of the patch. The minimum perimeter equals the perimeter if the patch would be maximally compact.

Units

None

Range

SHAPE_SD >= 0

Behaviour

Equals SHAPE_SD = 0 if all patches have an identical shape index. Increases, without limit, as the variation of the shape index increases.

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

Patton, D. R. 1975. A diversity index for quantifying habitat "edge". Wildl. Soc.Bull. 3:171-173.

See Also

lsm_p_shape, sd, lsm_c_shape_mn, lsm_c_shape_cv, lsm_l_shape_mn, lsm_l_shape_sd, lsm_l_shape_cv

Examples

# NOT RUN {
lsm_c_shape_sd(landscape)

# }