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

Mon Jan 25 12:44:20 EST 2016

Yes, this is the same issue that I am having.
Thanks,
Mike

      From: Benjamin Root <ben.v.root at gmail.com>
 To: Michael Droettboom <mdroettboom at continuum.io> 
Cc: Mike Tercek <miketercek at yahoo.com>; "matplotlib-devel at python.org" <matplotlib-devel at python.org>
 Sent: Monday, January 25, 2016 9:59 AM
 Subject: Re: [Matplotlib-devel] Possible bug in matplotlib versions 1.4 and higher with basemap arcgisimage imagery

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 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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Michael DroettboomContinuum Analytics

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