[Qgis-user] Problem with WMS 1.1.1 data providers in QGIS 2.0.1

[Bernhard Ströbl]

Hi Andreas,

Am 22.10.2013 14:44, schrieb Andreas Neumann:
> Hi all,
>
> I think the dpi parameter is a useful extension and should be added by
> the QGIS client (given that the dpi are really correctly detected).

Correct, therefore QGIS adds this parameter in different flavours for 
the most common WMS servers (I assume because this parameter is not 
defined in the WMS standard as has already been pointed out in this thread).

>
> If a WMS server chokes on additional paramters it is not very well
> designed. They can just ignore these extra parameters if they do not
> know how to deal with it.

My problem is not that geoserver chokes on the additional parameters but 
that for _some_ layers the geoserver-specific parameter 
"format_options=dpi:96" makes it throw an error.
I know that these layers are poorly configured but cannot do anything 
against it (because other software depends on them). My users currently 
cannot access these layers. Miguel Ángel Castro (who started this 
thread) described that he cannot access layers from 
http://idecan2.grafcan.es/ServicioWMS/EspNat

Therefore I opt for a configuration option to switch off the dpi 
parameter because public servers may be misconfigured and still people 
want to display their layers in QGIS.

Bernhard

>
> Just my opinion.
>
> Andreas
>
> Am 22.10.2013 10:30, schrieb Bernhard Ströbl:
>> Hi all,
>>
>> I have a similar issue with geoserver.
>> QGIS2 request is:
>> http://my_internal_server/geoserver/ows?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=my_bbox&CRS=my_crs&WIDTH=242&HEIGHT=278&LAYERS=my_layer&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE
>>
>> entering this URL in the browser results in a geoserver error message.
>> However if I leave out FORMAT_OPTIONS=dpi:96 (which, according to the
>> geoserver docs [1] should be supported) the map image is returned.
>> Two more remarks
>> 1) not all layers fail with this request
>> 2) QGIS 1.8 did not add this dpi-96 stuff, so all my layers worked in 1.8
>>
>> What was the reason to intoduce the dpi96 stuff and could we probably
>> change that to a configurable option (yes/no) of the WMS connection?
>>
>> Bernhard
>>
>> [1] http://docs.geoserver.org/latest/en/user/services/wms/vendor.html
>>
>> Am 22.10.2013 10:12, schrieb Miguel Ángel Castro:
>>> Hi Richard,
>>>
>>> I can see what you show to me.
>>>
>>> But, this problem not takes place in QGIS 1.8.0 with this WMS data
>>> source (
>>> http://idecan2.grafcan.es/ServicioWMS/EspNat) and similar others.
>>>
>>> Something in wmsprovider.dll of QGIS 2.0.1?
>>>
>>> Thanks in advance
>>> Miguel Ángel Castro
>>>
>>>
>>>
>>> __________ Information from ESET Mail Security, version of virus
>>> signature database 8948 (20131022) __________
>>>
>>> The message was checked by ESET Mail Security.
>>> http://www.eset.com
>>>
>>
>>
>> __________ Information from ESET Mail Security, version of virus
>> signature database 8948 (20131022) __________
>>
>> The message was checked by ESET Mail Security.
>> http://www.eset.com
>>
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>


__________ Information from ESET Mail Security, version of virus signature database 8949 (20131022) __________

The message was checked by ESET Mail Security.
http://www.eset.com