<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Noah,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For some reason the server isn't sending the 'Content-Type' http header when you make a large request and it is sending an empty (zero length) response. Probably this is deliberate. OWSLib could handle it more gracefully but I think it's ultimately a server limitation.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You can see this as follows if you make the request directly using urllib2.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In [59]: from urllib2 import urlopen<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In [60]: ubig=urlopen('http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetMap&service=WMS&CRS=EPSG:4326&bbox=-111.85738494873,%2039.9462890625,%20-110.98876849262,%2040.445555601989&width=8000&height=4590&format=image/jpeg')<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In [61]: usmall=urlopen('http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetMap&service=WMS&CRS=EPSG:4326&bbox=-111.85738494873,%2039.9462890625,%20-110.98876849262,%2040.445555601989&width=800&height=459&format=image/jpeg')<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In [62]: ubig.info().headers<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Out[62]: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>['Cache-Control: private\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'X-Frame-Options: SAMEORIGIN\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Date: Thu, 25 Sep 2014 05:55:33 GMT\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Content-Length: 0\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Connection: Close\r\n']<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In [63]: usmall.info().headers<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Out[63]: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>['Cache-Control: private\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Content-Type: image/jpeg\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'X-Frame-Options: SAMEORIGIN\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Date: Thu, 25 Sep 2014 05:55:36 GMT\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Content-Length: 6497\r\n',<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 'Connection: Close\r\n']<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dom<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> owslib-users-bounces@lists.osgeo.org [mailto:owslib-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Noah Taylor<br><b>Sent:</b> Thursday, 25 September 2014 3:15 PM<br><b>To:</b> owslib-users@lists.osgeo.org<br><b>Subject:</b> [OWSLib-users] Download Large Sizes for WMS Request in OWSLib<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hi,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I have been having troubles finding a working WMS server for OWSLib but I finally found a URL that is working with my code:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetCapabilities&service=WMS">http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetCapabilities&service=WMS</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I'd like to have a world map at this high resolution since this is just a U.S. map, if anybody knows of any, but in any case the problem I am facing now is that when I attempt to call a large size, I get the following error:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><b>KeyError: 'content-type'</b><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The error does not show up if I stay below or close to 3MB so I am unsure if this is a limit that the WMS server is imposing on me or if it is an error in the Python code. I read somewhere there is a default limit to act as the safeguard to the user so they don't accidentally download more than they can handle but am unsure. I will post my 'working' script below. You will only need to run it to see the error and downsize the size for it to actually download the request.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks for your time<br>Noah<o:p></o:p></p></div><div><p class=MsoNormal><br>###################################################################<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>from owslib.wms import WebMapService<o:p></o:p></p></div><div><p class=MsoNormal>wms = WebMapService('<a href="http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetCapabilities&service=WMS">http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetCapabilities&service=WMS</a>')<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>print(wms.identification.type)<o:p></o:p></p></div><div><p class=MsoNormal>print(wms.identification.title)<o:p></o:p></p></div><div><p class=MsoNormal>print(list(wms.contents))<o:p></o:p></p></div><div><p class=MsoNormal>print(wms['0'].title)<o:p></o:p></p></div><div><p class=MsoNormal>print(wms['0'].boundingBox)<o:p></o:p></p></div><div><p class=MsoNormal>print(wms['0'].crsOptions)<o:p></o:p></p></div><div><p class=MsoNormal>print(wms['0'].styles)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>print(wms.getOperationByName('GetMap').formatOptions)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>print(list(wms.contents))<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>img = wms.getmap( layers=['0'],<o:p></o:p></p></div><div><p class=MsoNormal> styles=[],<o:p></o:p></p></div><div><p class=MsoNormal> srs='EPSG:4326',<o:p></o:p></p></div><div><p class=MsoNormal> bbox=(-111.85738494873, 39.9462890625, -110.98876849262, 40.445555601989),<o:p></o:p></p></div><div><p class=MsoNormal> size=(8000, 4598),<o:p></o:p></p></div><div><p class=MsoNormal> format='image/jpeg',<o:p></o:p></p></div><div><p class=MsoNormal> transparent=True,<o:p></o:p></p></div><div><p class=MsoNormal> stream = True)<o:p></o:p></p></div><div><p class=MsoNormal>out = open('nationalmap.jpg', 'wb')<o:p></o:p></p></div><div><p class=MsoNormal>out.write(img.read())<o:p></o:p></p></div><div><p class=MsoNormal>out.close()<o:p></o:p></p></div></div></div></div></body></html>