python - 使用 python basemap 和 pyproj 时出现运行时错误？

Question

我使用带有 mpl_toolkits basemap 的 Spyder IDE 编写了一个脚本，将 GPS 轨迹绘制为按速度着色的方向箭头。在我将 pandas 升级到 0.13 之前一切正常。数据是这样的:

                            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)

现在，当我尝试运行这一行时:

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)

我收到这个错误:

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

如果我删除 latlon=True 参数，它会运行但不会显示数据。有什么想法吗？

Answer 1

无论出于何种原因，Basemap.quiver 都不喜欢在升级后采用 Pandas DataFrame 列。我改变了:gMap.quiver(AllPoints['lon'],AllPoints['lat']...)至:gMap.quiver(AllPoints['lon'].values,AllPoints['lat'].values....)现在工作正常。