fig = plt.figure()
ax = fig.add_subplot(projection=ccrs.NearsidePerspective(140, 40))
ax.coastlines()
ax.gridlines(**glstyle)
im = ax.imshow(v, cmap=plt.cm.jet,
               extent=[-180,180,-90,90], transform=ccrs.PlateCarree())
fig.colorbar(im)