landscapemetrics (version 1.4.4)

lsm_c_ca: CA (class level)

Description

Total (class) area (Area and edge metric)

Usage

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

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

CA is an 'Area and edge metric' and a measure of composition. The total (class) area sums the area of all patches belonging to class i. It shows if the landscape is e.g. dominated by one class or if all classes are equally present. CA is an absolute measure, making comparisons among landscapes with different total areas difficult.

Units

Hectares

Range

CA > 0

Behaviour

Approaches CA > 0 as the patch areas of class i become small. Increases, without limit, as the patch areas of class i become large. CA = TA if only one class is present.

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, sum, lsm_l_ta

Examples

# NOT RUN {
lsm_c_ca(landscape)

# }