Re: [Matplotlib-users] Basemap: draw parallels/meridians based on rotated pole

Hi Maik,

Not entirely sure what you're after (a picture may have helped), but I know
Basemap has relatively recently added rotated pole coordinate system
support which may be of use. I'm not sure how well that goes with the
meridian/parallel drawing within Basemap though.

Alternatively, if I've understood you correctly, I've put together an
example using cartopy which first produces a map in "Geomagnetic" space
(with traditional latitude and longitude meridians/parallels) and then by
drawing a north polar stereographic map first with the geomagnetic
latitudes and longitudes (for 2010) next to the WGS84 latitudes and
longitudes.

Notebook can be found
http://nbviewer.ipython.org/gist/pelson/7b461a798e454533d4ef

The key is that you can make a map of any projection, and later add data
from any source coordinate system (transform) and they should play nicely
in Cartopy.

Is this the kind of thing you're after?

Cheers,

Phil



On 12 May 2014 13:18, Maik Riechert <mai...@ar...> wrote:

> Hi,
>
> I'm drawing a stereographic map, my data is in geographic latitude,
> longitude coordinates. But instead of drawing parallels/meridians based
> on the geographic poles I need to draw them based on the geomagnetic
> poles, that is, the poles are rotated. E.g. in 2010 the north
> geomagnetic pole was at 80.08°N 72.21°W
> (https://en.wikipedia.org/wiki/Geomagnetic_pole). In my case it's for
> aurora research, and many existing maps are drawn in this way, so
> naturally it becomes easier to compare them if they are based on the
> same coordinate system.
>
> Is this somehow achievable with basemap? Note that I'd like to draw
> country borders etc. as well. (Otherwise I could just transform my
> geographic coordinates to magnetic coordinates and use standard basemap.)
>
> Thanks
> Maik
>
>
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