On Fri, Jul 15, 2011 at 1:44 PM, Yoshi Rokuko <yo...@rokuko.net> wrote:
> +--------------------------------------------- Jeff Whitaker -----------+
> > On 7/14/11 2:25 PM, Yoshi Rokuko wrote:
> > > hi, is it possible to restrict a contour plot to a
> > > country? if i grid my data to projection coordinates
> > > and then make a contour plot i can draw the country
> > > borders on top, but since the data plotted outside
> > > the country is a gridding artifact i would rather
> > > not plot it.
> >
> > Yoshi: There is no mechanism for doing this. It is possible, but you
> > would need a way to create a mask for all the grid points outside the
> > country of interest, and then use this mask to create a masked array to
> > pass to contourf.
> >
> > -Jeff
>
> wouldn't it be possible to create such a mask using internals from
> Basemap.drawcountries() somehow?
>
> best regards, yoshi
>
>
Jeff, I just had a thought....
Isn't the country borders drawn as Path or Polygon objects? I believe there
are some matplotlib internal functions that can be given a list of points
(such as those for a grid) and a path and it will return which points are
within the path and which are outside. One could use that to make the mask.
Might make for a nice feature for basemap in the upcoming v1.1.0 release.
Ben Root
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