[ckan-dev] problem with spatial previews

Matthew Fullerton matt.fullerton at gmail.com
Thu Aug 13 13:40:42 UTC 2015 

Hello again,
I made a pull request for the parameters problem:
https://github.com/ckan/ckanext-geoview/pull/23

Which gets the WFS to the point where it can read the capabilities and
tries to get individual layer data using POST requests. Unfortunately at
that point I get another error from the GeoServer: "Bitte einen
Servicenamen angeben!". I.e. please give a service name. The XML being sent
in the body looks sensible. I've tried adding 'SERVICE=WFS' in the url, it
doesn't help. I'm stumped. But it is nice to see a WFS source that at least
gets to this stage, and solve a side-issue of extra parameters being
deleted from the URLs.

Maybe someone with inside info about your GeoServer can decipher that
message. I haven't found any viewer on your website that uses the WFS data,
so I can't see an example request to figure it out.

Best,
Matt

On 13 August 2015 at 11:56, Matthew Fullerton <matt.fullerton at gmail.com>
wrote:

> Hi Armin,
> A problem in general with a lot of your links is that they require extra
> URL parameters. In its current form, the geo-view wants to truncate the
> link and then add the SERVICE and REQUEST itself, which is not enough to
> get data from your geoserver(s). I just experimented with the code to get
> it to preserve additional parameters. It worked, but its experimental :-)
>
> I did manage to find a RLP link that "worked" in CKAN, via the RLP open
> data portal:
>
> http://213.139.159.34/geoserver/wsg/wfs?SERVICE=WFS&VERSION=1.1.0&REQUEST=GetCapabilities&SERVICE=WFS
>
> When you exchange WMS for WFS, it works. But WFS gives me the same error
> as I always get about "uncaught exception: Can't find a WFSCapabilities
> parser for version 2.0.0". So I'm not making any progress here.
>
> When you are able to, send me a WFS link that "works" in your CKAN in the
> sense that you get the transform error but not the parser error.
>
> I'll try and clean up my code for preserving the extra parameters and
> submit a pull request.
>
> I didn't write open layers, open layers helper or geo-view extension, so I
> can't answer your question about transforms. My understanding was that
> because WFS is vector data open layers has the ability to shape it to a
> base map.
>
> Best,
> Matt
>
>
>
> On 12 August 2015 at 14:42, Armin Retterath <armin.retterath at gmail.com>
> wrote:
>
>>
>> http://mapserver.lgb-rlp.de/cgi-bin/erdbeben?&request=GetCapabilities&VERSION=1.1.0&SERVICE=WFS
>>
>> but we have hundreds of wfs in our geoportal ;-)
>>
>> http://www.geoportal.rlp.de
>>
>> if you need another link, please ask - ckan 2.4 was able to request the
>> caps and show the featuretypes as layers in the ol client - only the get
>> feature request has the problem with the wrong crs
>> armin
>>
>>
>> 2015-08-12 15:31 GMT+02:00 Matthew Fullerton <matt.fullerton at gmail.com>:
>>
>>> Can you send me the WFS link? Is it open? It would be interesting to
>>> have a link which doesn't have the XML problem, in which case it could of
>>> course be that there are further problems!
>>>
>>> Thanks,
>>> Matt
>>>
>>> On 12 August 2015 at 13:56, Armin Retterath <armin.retterath at gmail.com>
>>> wrote:
>>>
>>>> you can see the message in firebug. also the wfs response is there and
>>>> the server gives an exception for the epsg:3857. the problem is, that my
>>>> installation is in our intranet and not available in the www already (i've
>>>> got the same problem as it was on the list today - proxying is not
>>>> possible, because ckan don't react on the site_url definition :-( )
>>>> i can give you further information tomorrow ;-)
>>>> thanx
>>>> armin
>>>>
>>>> 2015-08-12 12:52 GMT+02:00 Matthew Fullerton <matt.fullerton at gmail.com>
>>>> :
>>>>
>>>>> My problem so far was that OpenLayers said it couldn't cope with that
>>>>> version of the XML standard. Where in the code do you see the demand for
>>>>> 3857? There was a similar issue with the WMS code. However, for WFS I would
>>>>> have though that it should be less of a problem as the data can be
>>>>> transformed.
>>>>>
>>>>> -Matt
>>>>>
>>>>> On 12 August 2015 at 11:38, Armin Retterath <armin.retterath at gmail.com
>>>>> > wrote:
>>>>>
>>>>>> hi matt,
>>>>>> the wfs may have a problem with the requested crs - the client
>>>>>> demands epsg:3857 but most services support only 4326 - maybe we have to
>>>>>> alter the default crs in the ini file?
>>>>>> best regards,
>>>>>> armin
>>>>>>
>>>>>> 2015-08-12 11:59 GMT+02:00 Matthew Fullerton <
>>>>>> matt.fullerton at gmail.com>:
>>>>>>
>>>>>>> I can confirm that WFS does not work.
>>>>>>>
>>>>>>> KML, GeoJSON and WMS should all be working:
>>>>>>> KML:
>>>>>>> https://smartlane.io/dataset/different-geo-visualizations/resource/06df2d49-5920-42e8-b73d-860aeea823a8
>>>>>>> GeoJSON works but I recommend you use the GeoJSON view installed
>>>>>>> with ckanext_geoview and not the openlayers view.
>>>>>>> https://smartlane.io/dataset/different-geo-visualizations/resource/d31fcbfb-6611-48b5-91f4-630553316521
>>>>>>> WMS:
>>>>>>> https://smartlane.io/dataset/different-geo-visualizations/resource/045d88a8-6a1e-4f41-b23c-fa5efa549d34
>>>>>>>
>>>>>>> Regarding WMS take a look at the URL on the example page to check
>>>>>>> you are putting something sensible in. There is a request to visualize
>>>>>>> individual layers (https://github.com/ckan/ckanext-geoview/issues/22
>>>>>>> )
>>>>>>>
>>>>>>> And in general, it's worth installing the extension from the latest
>>>>>>> master code on GitHub and not from pip.
>>>>>>>
>>>>>>> Best,
>>>>>>> Matt
>>>>>>>
>>>>>>> On 12 August 2015 at 10:45, Armin Retterath <
>>>>>>> armin.retterath at gmail.com> wrote:
>>>>>>>
>>>>>>>> hi sol,
>>>>>>>>
>>>>>>>> i solved the issue by activating the view in the frontend - maybe
>>>>>>>> the docu is not quiet clear :-( .
>>>>>>>> i thought, that the default view will sufficient - but
>>>>>>>> ckan.views.default_views setting don't activate the views for the resource
>>>>>>>> automatically :-( - i had to activate it in the frontend for each view - is
>>>>>>>> this realistic?
>>>>>>>> another problem is, that the wms preview don't work as it should
>>>>>>>> do. the layers are directly requested with the url of the that is defined
>>>>>>>> in the resource. this is not right. first the GetCapabilities request has
>>>>>>>> to be done and the GetMap url has to be extracted. with this url the map
>>>>>>>> can be invoked correctly. i 've done a adoption for the code two years ago.
>>>>>>>> maybe i find it and can give it back to the list.
>>>>>>>>
>>>>>>>> also simple wfs are not supported - i tested
>>>>>>>> http://mapserver.lgb-rlp.de/cgi-bin/erdbeben?&request=GetCapabilities&VERSION=1.1.0&SERVICE=WFS
>>>>>>>>
>>>>>>>> i also tested kml and geojson preview with follwoning urls:
>>>>>>>>
>>>>>>>>
>>>>>>>> http://www.geoportal.rlp.de/mapbender/php/mod_GetPublishedData.php?wmc_id=13986&outputFormat=geojson
>>>>>>>>
>>>>>>>> http://www.geoportal.rlp.de/mapbender/php/mod_GetPublishedData.php?wmc_id=13986&outputFormat=kml
>>>>>>>>
>>>>>>>> but the resource is not shown on the map :-( - maybe s.o. knows the
>>>>>>>> problem.
>>>>>>>>
>>>>>>>> thanx in advance,
>>>>>>>> armin
>>>>>>>>
>>>>>>>> 2015-08-12 4:23 GMT+02:00 李承錱[Sol] <u103133.u103135 at gmail.com>:
>>>>>>>>
>>>>>>>>> Hi Armin:
>>>>>>>>>
>>>>>>>>> I'm using CKAN 2.4.0 and ckanext-geoview without any problems.
>>>>>>>>>
>>>>>>>>> Is there any error in the log file?
>>>>>>>>>
>>>>>>>>> And, do you specify the correct format name in the resource
>>>>>>>>> metadata ("geojson" for geojson resources and "wms" for wms resources)? The
>>>>>>>>> format column for resource is required to decide the available views.
>>>>>>>>>
>>>>>>>>> To get the spatial search, you should still install the
>>>>>>>>> ckanext-spatial
>>>>>>>>> <http://ckanext-spatial.readthedocs.org/en/latest/install.html>
>>>>>>>>> extension and follow the guide
>>>>>>>>> <http://ckanext-spatial.readthedocs.org/en/latest/spatial-search.html>
>>>>>>>>> to set up it. The ckanext-geoview is only for previewing spatial resources.
>>>>>>>>>
>>>>>>>>> Cheers,
>>>>>>>>>
>>>>>>>>> Sol
>>>>>>>>>
>>>>>>>>> 2015-08-10 23:22 GMT+08:00 Armin Retterath <
>>>>>>>>> armin.retterath at gmail.com>:
>>>>>>>>>
>>>>>>>>>> hi matt,
>>>>>>>>>>
>>>>>>>>>> thanx for the info.
>>>>>>>>>>
>>>>>>>>>> i set now set following definitions:
>>>>>>>>>>
>>>>>>>>>> ckan.plugins = stats geo_view text_view datastore image_view
>>>>>>>>>> resource_proxy
>>>>>>>>>> ckan.views.default = image_view geo_view
>>>>>>>>>> ckan.spatial.srid = 4326
>>>>>>>>>> ckanext.geoview.ol_viewer.formats = wms kml geojson
>>>>>>>>>>
>>>>>>>>>> but nothing happens .-( . before i activated both plugins - also
>>>>>>>>>> nothing happens. neither the spatial_metadata nor spatial_query had any
>>>>>>>>>> effect on the portal - do i have to do more configuration? maybe activate a
>>>>>>>>>> spatial search widget as it was so in 1.8.1b - which i tested some years
>>>>>>>>>> ago?
>>>>>>>>>>
>>>>>>>>>> i need a spatial search widget and options to view wms, geojson
>>>>>>>>>> and maybe use wfs.
>>>>>>>>>>
>>>>>>>>>> - or should i go directly to 2.5a - is there a compatibility list
>>>>>>>>>> for the spatial extensions? can they be activated parallel?
>>>>>>>>>>
>>>>>>>>>> thanx in advance,
>>>>>>>>>>
>>>>>>>>>> armin
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> 2015-08-10 12:20 GMT+02:00 Matthew Fullerton <
>>>>>>>>>> matthew at smartlane.de>:
>>>>>>>>>>
>>>>>>>>>>> Dear Armin,
>>>>>>>>>>> Are you using ckanext-geoview or ckanext-spatial?
>>>>>>>>>>>
>>>>>>>>>>> For the WMS viewer I think you need to specify which file types
>>>>>>>>>>> you want to offer previews for, e.g.:
>>>>>>>>>>> ckanext.geoview.ol_viewer.formats = wms kml
>>>>>>>>>>> https://github.com/ckan/ckanext-geoview#openlayers-viewer
>>>>>>>>>>>
>>>>>>>>>>> In general, and specifically for the GeoJSON problem, check that
>>>>>>>>>>> the file formats are set for the resource. I think it needs to be 'geojson'
>>>>>>>>>>> for a GeoJSON file and 'wms' for the WMS resource.
>>>>>>>>>>>
>>>>>>>>>>> Best,
>>>>>>>>>>> Matt
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> *Projekt SMARTLANE*
>>>>>>>>>>>
>>>>>>>>>>> matthew at smartlane.de <florian at smartlane.de>
>>>>>>>>>>> T +49.89.289.28575
>>>>>>>>>>> F +49.89.289.22333
>>>>>>>>>>> www.smartlane.de
>>>>>>>>>>>
>>>>>>>>>>> EXIST-Gründungsvorhaben „Tapestry“
>>>>>>>>>>> c/o Lehrstuhl für Verkehrstechnik
>>>>>>>>>>> Technische Universität München
>>>>>>>>>>> Arcisstraße 21
>>>>>>>>>>> 80333 München
>>>>>>>>>>>
>>>>>>>>>>> Gefördert vom Bundesministerium für Wirtschaft und Technologie
>>>>>>>>>>> aufgrund eines Beschlusses des Deutschen Bundestages.
>>>>>>>>>>>
>>>>>>>>>>> ------------------------------
>>>>>>>>>>> *Von:* ckan-dev <ckan-dev-bounces at lists.okfn.org> im Auftrag
>>>>>>>>>>> von Armin Retterath <armin.retterath at gmail.com>
>>>>>>>>>>> *Gesendet:* Freitag, 7. August 2015 12:07
>>>>>>>>>>> *An:* CKAN Development Discussions
>>>>>>>>>>> *Betreff:* [ckan-dev] problem with spatial previews
>>>>>>>>>>>
>>>>>>>>>>> hello together,
>>>>>>>>>>> i freshly installed ckan 2.4.0 with the spatial extensions on an
>>>>>>>>>>> debian 8 environment (including  datastore).
>>>>>>>>>>> in the frontend the options for show wms, geojson, ... are not
>>>>>>>>>>> displayed :-( .
>>>>>>>>>>> it seems to be, that ckan don't find the plugins?
>>>>>>>>>>> here are my entries in the development.ini:
>>>>>>>>>>>
>>>>>>>>>>> ckan.plugins = stats text_view datastore image_view recline_view
>>>>>>>>>>> spatial_metadata spatial_query geo_view geojson_view resource_proxy
>>>>>>>>>>>
>>>>>>>>>>> # Define which views should be created by default
>>>>>>>>>>> # (plugins must be loaded in ckan.plugins)
>>>>>>>>>>> ckan.views.default_views = ckanext-geoview geojson_view geo_view
>>>>>>>>>>> image_view text_view recline_view recline_map_view
>>>>>>>>>>>
>>>>>>>>>>> thanx in advance
>>>>>>>>>>> armin
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>> https://lists.okfn.org/mailman/listinfo/ckan-dev
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>>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>>>
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