Contour plot of spherical data using a von Mises-Fisher kernel density estimate.
vmf.kerncontour(u, thumb = "none")
A two column matrix. The first coolumn is the latitude and the second is the longitude.
This is either 'none' (defualt), or 'rot' for the rule of thumb suggested by Garcia-Portugues (2013). If it is "none" it is estimated via cross validation, with the fast function "vmfkde.tune_2".
It calcculates the contour plot using a von Mises-Fisher kernel for spherical data only.
A plot with the data in latitude and longitude along with their kernel density estimate contour lines.
Garcia Portugues, E. (2013). Exact risk improvement of bandwidth selectors for kernel density estimation with directional data. Electronic Journal of Statistics, 7, 1655–1685.
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