Mean fractal dimension index (Shape metric)
lsm_l_frac_mn(landscape, directions)# S3 method for RasterLayer
lsm_l_frac_mn(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_frac_mn(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_frac_mn(landscape, directions = 8)
# S3 method for stars
lsm_l_frac_mn(landscape, directions = 8)
# S3 method for list
lsm_l_frac_mn(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
$$FRAC_{MN} = mean(FRAC[patch_{ij}])$$ where \(FRAC[patch_{ij}]\) equals the fractal dimension index of each patch.
FRAC_MN is a 'Shape metric'. The metric summarises the landscape as the mean 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. The Coefficient of variation is scaled to the mean and comparable among different landscapes.
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
,
mean
,
lsm_c_frac_mn
,
lsm_c_frac_sd
,
lsm_c_frac_cv
,
lsm_l_frac_sd
,
lsm_l_frac_cv
# NOT RUN {
lsm_l_frac_mn(landscape)
# }
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