I have run into problems when using Basemap.contour
with certain projections. Based on the example given in the Basemap documentation, I created the following working code which produces the expected result. The example uses the 'tmerc' projection.
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
m2 = Basemap(projection='tmerc',
lat_0=0, lon_0=3,
llcrnrlon=1.819757266426611,
llcrnrlat=41.583851612359275,
urcrnrlon=1.841589961763497,
urcrnrlat=41.598674173123)
##m2 = Basemap(projection='kav7',lon_0=0)
x = np.linspace(0, m2.urcrnrx, 100)
y = np.linspace(0, m2.urcrnry, 100)
xx, yy = np.meshgrid(x, y)
data = np.sin(xx/100)*np.cos(yy/100)
levels = np.linspace(-1,1,8)
m2.contour(xx, yy, data, levels)
plt.show()
However, if I switch to using the 'kav7' projection in the alternative m2=Basemap
declaration (commented out in the example code), the code fails with the following error:
Traceback (most recent call last):
File "basemap_contour.py", line 20, in <module>
m2.contour(xx, yy, data, levels)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/mpl_toolkits/basemap/__init__.py", line 521, in with_transform
return plotfunc(self,x,y,data,*args,**kwargs)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/mpl_toolkits/basemap/__init__.py", line 3542, in contour
xx = x[x.shape[0]/2,:]
IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices
Note that this also happens when I define lon
and lat
values 'properly', the example was only chosen to be as short as possible. Does anybody know how to resolve this?
EDIT:
In case this is relevant, I'm using python
version 3.5.3 on an osx
Sierra machine. The matplotlib
version is 2.0.0 and the basemap
version is 1.0.7 .
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