I wrote a script using Spyder IDE with mpl_toolkits basemap to plot a GPS track as arrows for direction colored by speed. Everything worked fine until I upgraded pandas to 0.13. The data is like this:
lon lat bearing speed m/s
2014-01-20 16:26:00 -170.681264 -14.290060 NaN NaN
2014-01-20 16:27:00 -170.681259 -14.290074 163.753636 0.026727
2014-01-20 16:28:00 -170.681259 -14.290074 180.000000 0.001172
2014-01-20 16:29:00 -170.681259 -14.290077 180.000000 0.004981
ll = [-14.294238,-170.683732]
ur = [-14.286362, -170.673260]
gMap = Basemap(projection='merc', resolution='f',
llcrnrlon=ll[1], llcrnrlat=ll[0],
urcrnrlon=ur[1], urcrnrlat=ur[0],ax=ax)
Now when I try to run this line:
gMap.quiver(AllPoints['lon'],AllPoints['lat'],sin(radians(AllPoints['bearing'])),cos(radians(AllPoints['bearing'])),latlon=True,color=Points['speed m/s'].values,scale=40,cmap=plt.cm.rainbow)
I get this error:
Traceback (most recent call last):
File "", line 1, in
File "C:\Python27\lib\site-packages\mpl_toolkits\basemap\__init__.py", line 559, in with_transform
x, y = self(x,y)
File "C:\Python27\lib\site-packages\mpl_toolkits\basemap\__init__.py", line 1148, in __call__
xout,yout = self.projtran(x,y,inverse=inverse)
File "C:\Python27\lib\site-packages\mpl_toolkits\basemap\proj.py", line 286, in __call__
outx,outy = self._proj4(x, y, inverse=inverse)
File "C:\Python27\lib\site-packages\mpl_toolkits\basemap\pyproj.py", line 388, in __call__
_proj.Proj._fwd(self, inx, iny, radians=radians, errcheck=errcheck)
File "_proj.pyx", line 124, in _proj.Proj._fwd (src/_proj.c:1594)
RuntimeError
If I remove the latlon=True arguement it runs but does not display the data. Any ideas what is wrong?
For whatever reason, Basemap.quiver doesn't like taking Pandas DataFrame columns after upgrading. I changed: gMap.quiver(AllPoints['lon'],AllPoints['lat']....) to: gMap.quiver(AllPoints['lon'].values,AllPoints['lat'].values....) and it works fine now.
来源：https://stackoverflow.com/questions/23550820/runtime-error-using-python-basemap-and-pyproj