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

[Michael Droettboom]

I think https://github.com/matplotlib/matplotlib/pull/5910 should fix it.

On Mon, Jan 25, 2016 at 11:59 AM, Benjamin Root <ben.v.root at gmail.com>
wrote:

> Mike, this is where I noticed this before:
> https://github.com/matplotlib/basemap/issues/242
>
> Simple example:
>
> import matplotlib.pyplot as plt
> from mpl_toolkits.basemap import Basemap
>
> m=Basemap(projection='cyl',llcrnrlon=-90,llcrnrlat=30,urcrnrlon=-60,urcrnrlat=60)
> m.arcgisimage(verbose=True)
> plt.show()
>
>
> Ben Root
>
>
>
> On Mon, Jan 25, 2016 at 11:32 AM, Michael Droettboom <
> mdroettboom at continuum.io> wrote:
>
>> Can you provide a standalone example to reproduce, or fire up the
>> debugger and let me know that the value of "basemap_url" is on line 4270 of
>> basemap/__init__.py?  Were that to point to somewhere that fails, one would
>> expect this error.  (Though in the case of 1.5.1 something additionally
>> funky is going on, I'm not necessarily surprised by the result with 1.4.3
>> without additional information).
>>
>> Mike
>>
>> On Mon, Jan 25, 2016 at 10:53 AM, Benjamin Root <ben.v.root at gmail.com>
>> wrote:
>>
>>> Yes, I recently noticed this, too. CC-ing Mike Droettboom, I think this
>>> is caused by our recent changes to _image.cpp to add error-checking.
>>>
>>> Ben Root
>>>
>>> On Fri, Jan 22, 2016 at 3:43 AM, Mike Tercek via Matplotlib-devel <
>>> matplotlib-devel at python.org> wrote:
>>>
>>>> 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 linux
>>>> Type "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 linux
>>>> Type "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
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Matplotlib-devel mailing list
>>>> Matplotlib-devel at python.org
>>>> https://mail.python.org/mailman/listinfo/matplotlib-devel
>>>>
>>>>
>>>
>>
>>
>> --
>> Michael Droettboom
>> Continuum Analytics
>>
>
>


-- 
Michael Droettboom
Continuum Analytics
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