Standard deviation fractal dimension index (Shape metric)
lsm_l_frac_sd(landscape, directions)# S3 method for RasterLayer
lsm_l_frac_sd(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_frac_sd(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_frac_sd(landscape, directions = 8)
# S3 method for stars
lsm_l_frac_sd(landscape, directions = 8)
# S3 method for list
lsm_l_frac_sd(landscape, directions = 8)
Raster* Layer, Stack, Brick or a list of rasterLayers.
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).
tibble
$$FRAC_{SD} = sd(FRAC[patch_{ij}])$$ where \(FRAC[patch_{ij}]\) equals the fractal dimension index of each patch.
FRAC_SD is a 'Shape metric'. The metric summarises the landscape as the standard deviation of the fractal dimension index of all patches in the landscape. The fractal dimension index is based on the patch perimeter and the patch area and describes the patch complexity.
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
Mandelbrot, B. B. 1977. Fractals: Form, Chance, and Dimension. San Francisco. W. H. Freeman and Company.
lsm_p_frac
,
sd
,
lsm_c_frac_mn
,
lsm_c_frac_sd
,
lsm_c_frac_cv
,
lsm_l_frac_mn
,
lsm_l_frac_cv
# NOT RUN {
lsm_l_frac_sd(landscape)
# }
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