HHCF()

Internal; derives a onedimensional heightheight correlation function 
alpha_plot()

Internal companion function to get_alpha . 
filter_alpha()

Filters the alpha values of alpha returned by get_all_alpha() between zero and the 99.9% quantile of the initial alphas 
get_all_alpha()

Wrapper to extract all roughness exponents from the HHCFs 
get_alpha()

Estimates the roughness exponent from the HHCF from spline fit. 
get_hhcf()

This wrapper function derives the onedimensional HHCF() for all columns or rows of a matrix 
get_zeta()

Wrapper function to derive the anisotropy exponent from a nonrotated raster 
get_zeta_()

Internal function to derive the anisotropy exponent from two roughness exponents 
summarise_alpha()

Wrapper to summarize alpha values 