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.
R implementation and documentation: Michail Tsagris <firstname.lastname@example.org> and Giorgos Athineou <email@example.com>
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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