Re: [Matplotlib-users] basemap: polar stereographic projection and clabel

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> Marcello Vichi <mailto:mar...@bo...>
> February 27, 2013 1:40 PM
> Thanks Jeff
>
> this is what I have
>
> In [1]: import matplotlib
> In [2]: matplotlib.__version__
> Out[2]: '1.2.0'

Marcello:  I asked what version of basemap you had, not matplotlib.   
Anyway, thanks for providing the script - with it I can reproduce the 
problem.  It looks like the Text instances returned by clabel are not 
being clipped properly.  Unfortunately, I don't have any idea why.  I'll 
get back to you if I find a solution.

BTW: you don't need to shift the lons and lats to represent the center 
of the gridbox (that's only needed for pcolor).

-Jeff
>
> I also tried with a different dataset, the one from
> http://matplotlib.org/basemap/users/examples.html
> and I get the same problem
>
> from mpl_toolkits.basemap import Basemap
> from netCDF4 import Dataset
> import numpy as np
> import matplotlib.pyplot as plt
> date = '20071215' # date to plot.
> # open dataset for that date.
> dataset = \
> Dataset('http://www.ncdc.noaa.gov/thredds/dodsC/oisst/NetCDF/AVHRR-AMSR/%s/AVHRR-AMSR/amsr-avhrr-v2.%s.nc.gz'% 
>
>        (date[0:4],date))
> # read sst.  Will automatically create a masked array using
> # missing_value variable attribute. 'squeeze out' singleton dimensions.
> sst = dataset.variables['sst'][:].squeeze()
> # read ice.
> ice = dataset.variables['ice'][:].squeeze()
> # read lats and lons (representing centers of grid boxes).
> lats = dataset.variables['lat'][:]
> lons = dataset.variables['lon'][:]
> # shift lats, lons so values represent edges of grid boxes
> # (as pcolor expects).
> delon = lons[1]-lons[0]; delat = lats[1]-lats[0]
> lons = (lons - 0.5*delon).tolist()
> lons.append(lons[-1]+delon)
> lons = np.array(lons,np.float64)
> lats = (lats - 0.5*delat).tolist()
> lats.append(lats[-1]+delat)
> lats = np.array(lats,np.float64)
> # create figure, axes instances.
> fig = plt.figure()
> ax = fig.add_axes([0.05,0.05,0.9,0.9])
> m = 
> Basemap(projection='spaeqd',lat_0=-90,lon_0=180,resolution='l',boundinglat=-40,round=True) 
>
> x, y = m(*np.meshgrid(lons, lats))
> o=m.drawcoastlines(linewidth=0.25)
> o=m.drawcountries(linewidth=0.25)
> o=m.fillcontinents(color="grey",lake_color='white')
> o=m.drawmeridians(np.arange(0,360,30),labels=[1,1,1,1])
> o=m.drawparallels(np.arange(-90,90,10),labels=[1,1,1,1])
> cim=m.contour(x[:-1,:-1],y[:-1,:-1],sst,arange(2,28,2),linewidths=0.5,colors='k') 
>
> plt.clabel(cim, inline=1, fontsize=10, fmt = '%.1f',)
>
>
>
>
> Jeff Whitaker <mailto:jef...@no...>
> February 27, 2013 11:59 AM
>
>
> Marcello: I cannot reproduce your problem.  From the github pull 
> request you mention, it seems like this was fixed about 3 months ago.  
> What version of basemap are you running?
>
> -Jeff
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> Marcello Vichi <mailto:mar...@bo...>
> February 19, 2013 7:33 AM
> When I plot contours in a stereographic south pole plot with a 
> bounding latitude and the rounded clipping
>
> Basemap(projection='spaeqd',lat_0=-90,lon_0=180,resolution='l',boundinglat=-40,round=True) 
>
>
> I see that the contours are correctly cut-off but not the contour 
> labels. They appear to be plotted according to a rectangular frame and 
> not the rounded one (see attached figure).
>
> Is it possible to mask the labels without having to mask the data?
>
> This issue may be related to an older topic:
> http://www.mail-archive.com/mat...@li.../msg02892.html 
>
> and to a more recent bugfix
> https://github.com/matplotlib/basemap/pull/89
> but I do not see any other clue
>
> thanks in advance
>
> marcello
>
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