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This is migrated from matplotlib/matplotlib#3404
There is a bug with point shifting when using latlon=True in Basemap.plot(), as discussed on http://stackoverflow.com/questions/25471723/plotting-on-a-basemap-unexpected-result/25472915: for instance, see the following code
from mpl_toolkits.basemap import Basemap
import numpy as np
import matplotlib.pyplot as plt
m = Basemap(projection='merc',llcrnrlat=-80,urcrnrlat=80,\
llcrnrlon=-180,urcrnrlon=180,lat_ts=20,resolution='l')
m.drawparallels(np.arange(-90.,91.,30.))
m.drawmeridians(np.arange(-180.,181.,60.))
lon=[
-44.897539694478894,
-79.56264363246461,
-108.31264586027467,
-129.5832433799378,
-149.11755440233293,
173.04624586158417,
57.26114485166647,
26.06650557322952,
6.8910540489469785,
-15.059586144625898]
lat=[
-23.30021206811055,
-22.174848810053106,
-6.169632450760373,
18.199421172044598,
45.95724594253466,
72.89364342463014,
69.39230460744983,
41.88542137864501,
14.50656439517308,
-8.974170076274387]
m.plot(lon, lat, 'ro', markersize=14, mec='none', latlon=True)
m.plot(lon[:-1], lat[:-1], 'bo', markersize=10, mec='none', latlon=True)
m.plot(lon[1:], lat[1:], 'go', markersize=6, mec='none', latlon=True)
Output:
The red points should all coincide with the blue and green ones, but they don't.
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