Re: [Matplotlib-users] Basemap shiftgrid

[ChaoYue <cha...@gm...>]

Hi Michelle,

I might not fully understand your problem, could you have a look at this
thread and see if it helps?

http://matplotlib.1069221.n5.nabble.com/Fwd-Strange-behaviour-on-plotting-data-on-Ronbinson-projection-using-Basemap-td43222.html#a43233

Cheers,

Chao


On Wed, Aug 27, 2014 at 9:58 AM, mmc [via matplotlib] <
ml-...@n5...> wrote:

> Hi All,
>
> I am having problems plotting data in Basemap. I have tried some of the
> different projections such as Robinson and Equidistant Cylindrical, however
> kept running into the error
>
> WARNING: x coordinate not monotonically increasing - contour plot
> may not be what you expect.  If it looks odd, your can either
> adjust the map projection region to be consistent with your data, or
> (if your data is on a global lat/lon grid) use the shiftgrid
> function to adjust the data to be consistent with the map projection
> region (see examples/contour_demo.py).
>
>
> Having read some other forums, I see that it is due to the fact that the
> longitude is based on 0-360 rather that -180 to 180. I have been trying to
> rectify this with shiftgrid.
>
> I have used shiftgrid and have moved my longitudes to -180 to 180 however
> I keep running up with the error:
>
>
> ValueError: lon0 outside of range of lonsin
>
>
> I also manage to get one plot out, which has the right projection I want
> (I am looking over the Atlantic) however the data isnt shifting in line
> with the longitudes. Would anyone know why this is the case?
>
> I have am using shiftgrid as below and the Basemap projection of
> Equidistant cylindrical (I have also tried Robinson however end up with
> similar result of data not moving in line with the longitude)
>
> MSLP = aso_mslp.data
> MSLP_background = np.mean(MSLP, axis = 0)
>
>     # shifting grid to run from -180 to 180 rather than 0-360
>     MSLP_background,lon = shiftgrid(180., MSLP_background, lon,
> start=False)
>
>     #setting the map in order to plot the data
>     map = Basemap(projection ='cyl', llcrnrlat=-90, urcrnrlat=90,
> llcrnrlon=-180, urcrnrlon=180, resolution='c')
>
> Thanks
> Michelle
>
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