landscapemetrics (version 1.4.4)

lsm_l_area_sd: AREA_SD (landscape level)

Description

Standard deviation of patch area (Area and edge metric)

Usage

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

$$AREA_{SD} = sd(AREA[patch_{ij}])$$ where \(AREA[patch_{ij}]\) is the area of each patch in hectares.

AREA_SD is an 'Area and Edge metric'. The metric summarises the landscape as the standard deviation of all patch in the landscape. The metric describes the differences among all patches in the landscape.

Units

Hectares

Range

AREA_SD >= 0

Behaviour

Equals AREA_SD = 0 if all patches are identical in size. Increases, without limit, as the variation of patch areas 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

See Also

lsm_p_area, sd, lsm_c_area_mn, lsm_c_area_sd, lsm_c_area_cv lsm_l_area_mn, lsm_l_area_cv

Examples

# NOT RUN {
lsm_l_area_sd(landscape)

# }