Ortho projection fails at south pole in pcolormesh

I am plotting gridded satellite data using basemap 1.0.7 (I can't get 1.0.8 via pip yet). The grid is 0.25 degrees resolution, global coverage.

For polar views, I use pcolormesh. It works fine for the north polar view:

    bmap = Basemap(projection='ortho', lat_0=90, lon_0=270, resolution='c')
    show_map = bmap.pcolormesh(lons, lats, darray, vmin=vminval, vmax=vmaxval,
                               norm=norm, cmap=this_cmap, alpha=1.0, latlon=True)

but the corresponding map centered on the south pole plots garbage:

    bmap = Basemap(projection='ortho', lat_0=-90, lon_0=270, resolution='c')
    show_map = bmap.pcolormesh(lons, lats, darray, vmin=vminval, vmax=vmaxval,
                               norm=norm, cmap=this_cmap, alpha=1.0, latlon=True)

However, pcolor plots correctly at the south pole. This one is fine:

    bmap = Basemap(projection='ortho', lat_0=-90, lon_0=270, resolution='c')
    show_map = bmap.pcolor(lons, lats, darray, vmin=vminval, vmax=vmaxval,
                               norm=norm, cmap=this_cmap, alpha=1.0, latlon=True)

In this case, my gridded data array is pretty small and the time difference between pcolormesh and pcolor is negligible, but I'm guessing this is something that ought to be fixed, unless it already has been addressed in 1.0.8.

Reproduisez le problème avec les exemples Basemap fournis pour les pôles nord et sud en utilisant pcolormesh et pcolor, puis examinez l’implémentation de pcolormesh de Basemap et la gestion de sa projection. Le correctif est terminé lorsque pcolormesh en projection orthographique du pôle sud produit la même carte correcte que pcolor, sans introduire de régression dans le cas du pôle nord.