[Matplotlib-devel] Possible bug in matplotlib versions 1.4 and higher with basemap arcgisimage imagery

[Mike Tercek]

When I make a map with the basemap and try to insert a background image from acrgis servers, the following code works ok if I have maplotlib version 1.3.1 installed:
m = Basemap(llcrnrlon=ll_lon,llcrnrlat=ll_lat,urcrnrlon=ur_lon,urcrnrlat=ur_lat,epsg=3857,lat_0=latz,lon_0=lonz, fix_aspect = False)m.arcgisimage(service='ESRI_Imagery_World_2D', xpixels = 2000, verbose= False, dpi = 80)
However, if I have matplotlib version 1.4.3 installed I get the following error:
Python 3.4.3 (default, Oct 14 2015, 20:28:29) [GCC 4.8.4] on linuxType "help", "copyright", "credits" or "license" for more information.>>> runfile('/media/mt/7670100C700FD1B3/vegviz/contain/xv.py', wdir=r'/media/mt/7670100C700FD1B3/vegviz/contain')Content-Type: text/html
Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/usr/local/lib/python3.4/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 680, in runfile    execfile(filename, namespace)  File "/usr/local/lib/python3.4/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 85, in execfile    exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)  File "/media/mt/7670100C700FD1B3/vegviz/contain/xv.py", line 401, in <module>    m,fig = make_base_map(title,frame_bound,park_bound,inset,inset_location,inset_alignment,ll_lon,ll_lat,ur_lon,ur_lat,latz,lonz,True)  File "/media/mt/7670100C700FD1B3/vegviz/contain/xv.py", line 110, in make_base_map    m.arcgisimage(service='ESRI_Imagery_World_2D', xpixels = 2000, verbose= False, dpi = 80)  File "/usr/local/lib/python3.4/dist-packages/mpl_toolkits/basemap/__init__.py", line 4270, in arcgisimage    return self.imshow(imread(urllib.request.urlopen(basemap_url)),origin='upper')  File "/usr/local/lib/python3.4/dist-packages/matplotlib/image.py", line 1270, in imread    return handler(fname)RuntimeError: _image_module::readpng: file not recognized as a PNG file
And if I install matplotlib 1.5.1, I get this error:
Python 3.4.3 (default, Oct 14 2015, 20:28:29) [GCC 4.8.4] on linuxType "help", "copyright", "credits" or "license" for more information.>>> runfile('/media/mt/7670100C700FD1B3/vegviz/contain/xv.py', wdir=r'/media/mt/7670100C700FD1B3/vegviz/contain')Content-Type: text/html
Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/usr/local/lib/python3.4/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 680, in runfile    execfile(filename, namespace)  File "/usr/local/lib/python3.4/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 85, in execfile    exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)  File "/media/mt/7670100C700FD1B3/vegviz/contain/xv.py", line 401, in <module>    m,fig = make_base_map(title,frame_bound,park_bound,inset,inset_location,inset_alignment,ll_lon,ll_lat,ur_lon,ur_lat,latz,lonz,True)  File "/media/mt/7670100C700FD1B3/vegviz/contain/xv.py", line 110, in make_base_map    m.arcgisimage(service='ESRI_Imagery_World_2D', xpixels = 2000, verbose= False, dpi = 80)  File "/usr/local/lib/python3.4/dist-packages/mpl_toolkits/basemap/__init__.py", line 4270, in arcgisimage    return self.imshow(imread(urllib.request.urlopen(basemap_url)),origin='upper')  File "/usr/local/lib/python3.4/dist-packages/matplotlib/image.py", line 1326, in imread    return handler(fname)SystemError: error return without exception set

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