Re: [Matplotlib-users] could I get rid of the contour of Antarctica by using Basemap?

[Alex G. <ale...@co...>]

Hi Chao,

Actually it is possible to remove the borders for Antarctica with basemap.
The default method for drawing the continents in basemap, drawcontinents(),
returns an instance of matplotlib.collections.LineCollection. What you will
want to do is manually remove the line segments within the collection that
correspond to Antarctica. For example,

# m is a Basemap instance
lcol = m.drawcoastlines()
segs = lcol.get_segments()

for i, seg in enumerate(segs):
     # The segments are lists of ordered pairs in spherical (lon, lat),
coordinates.
     # We can filter out which ones correspond to Antarctica based on
latitude using numpy.any()
     if np.any(seg[:, 1] < -60):
          segs.pop(i)

lcol.set_segments(segs)

This should do the trick unless I made a silly typo somewhere.

Thanks,
Alex


On Mon, Dec 30, 2013 at 5:05 PM, Sterling Smith <sm...@fu...>wrote:

> Chao,
>
> I know nothing of the Basemap toolkit so I can't comment on the removal of
> continents, but presumably the text command you are using takes some
> keywords to set the properties of the bounding box.  Try setting the
> background of the bounding box to white so that your words show up cleanly.
>  Feel free to let me know that I'm barking up the wrong tree.
>
> -Sterling
>
> On Dec 30, 2013, at 3:46PM, Chao YUE wrote:
>
> > Dear all,
> >
> > Happy new year!
> >
> > I am using Basemap toolkit to make some maps, I would like to
> > write something at the bottom of the map, whose position is now
> > taken by the contourf of Antarctica. Is there a way I can keep contours
> > of other continents but suppressing the one for antarctica? I attached
> > showing why I would like to have this.
> >
> > thanks for any help,
> >
> > Chao
> > --
> >
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-- 
Alex Goodman
Graduate Research Assistant
Department of Atmospheric Science
Colorado State University