在x轴上旋转底图子午线标签

Question

Is it possible to rotate the meridian labels so that they are no longer overlapping? See the image for an example below. I don't want to reduce the number of meridian lines.

I've tried:

ax = plt.gca()
ax.set_xticklabels( meridians, rotation=45 )

This doesn't do anything in Basemap though.

Answer 1

The meridian labels aren't xaxis labels. You can still manipulate their text objects:

from mpl_toolkits.basemap import Basemap, cm
import numpy as np
import matplotlib.pyplot as plt

# create figure and axes instances
fig = plt.figure(figsize=(8,8))
ax = fig.add_axes([0.1,0.1,0.8,0.8])
# create polar stereographic Basemap instance.
m = Basemap(projection='stere',lon_0=0,lat_0=30.,lat_ts=45.,\
            width=10000000, height=4000000,
            rsphere=6371200.,resolution='l',area_thresh=10000)
m.drawcoastlines()
m.drawstates()
m.drawcountries()
# draw parallels.
parallels = np.arange(0.,90,5.)
m.drawparallels(parallels,labels=[1,0,0,0],fontsize=10)
# draw meridians
merid_values = np.arange(0.,360.,10.)
meridians = m.drawmeridians(merid_values,labels=[0,0,0,1],fontsize=10)
for m in meridians:
    try:
        meridians[m][1][0].set_rotation(45)
    except:
        pass
plt.show()

Answer 2

Just give an angle as the "rotation" argument of the mapproj.drawmeridians().

import mpl_toolkits.basemap as bm

mapproj = bm.Basemap(ax=ax1,projection='cyl',llcrnrlat=lat_mn, \
                     llcrnrlon= lon_mn,urcrnrlat= lat_mx, urcrnrlon=lon_mx)
mapproj.drawmeridians(lonlines, labels=[0,0,1,0],rotation=45)

That's it! Cheers!