[GeoNode-devel] [GeoNode-users] GeoNode - PyCSW integration issues

Thu Jul 27 04:49:47 PDT 2017

Hi Tom,
agree, the DublinCore was just a simplified example.

Currently on ISO output there's no layer/feature/coverage name at all, but
only the title.

Regards,

Alessio Fabiani

==
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Ing. Alessio Fabiani

@alfa7691
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GeoSolutions S.A.S.
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On Thu, Jul 27, 2017 at 1:39 PM, Tom Kralidis <tomkralidis at gmail.com> wrote:

> Hi Alessio: thanks for the info.  Comments interleaved:
>
> On Wed, 26 Jul 2017, Alessio Fabiani wrote:
>
> Date: Wed, 26 Jul 2017 11:10:36 +0200
>> From: Alessio Fabiani <alessio.fabiani at geo-solutions.it>
>> To: geonode-devel <geonode-devel at lists.osgeo.org>,
>>     geonode-users <geonode-users at lists.osgeo.org>
>> Subject: [GeoNode-users] GeoNode - PyCSW integration issues
>>
>> Dear all,
>> I want to highlight some important issues about the current integration
>> between GeoNode and PyCSW.
>>
>> Other than a non-trivial security issue (basically the CSW exposes
>> metadata
>> for all Layers no matter if they are accessible or not by the user),
>>
>
> This is in my queue to fix (half way there).
>
> one
>> more, I would say, big issue is that currently is not possible to
>> recognize
>> the Layer "real name" from the metadata documents.
>>
>> Let me provide an example. Here below a snippet of a DublinCore XML
>> produced by PyCSW
>>
>> ...
>> <csw:Record>
>>    <dc:identifier>941a8d7e-7159-11e7-b283-002215079c40</dc:identifier>
>>    <dc:title>san_andres_y_providencia_highway</dc:title>
>>    <dc:type>dataset</dc:type>
>>    <dc:subject/>
>>    ...
>>    <dct:references scheme="WWW:DOWNLOAD-1.0-http--download">
>> http://localhost:8080/geoserver/wms?request=GetLegendGraphic
>> &format=image/png&WIDTH=20&HEIGHT=20&
>> LAYER=geonode:san_andres_y_providencia_highway&
>> legend_options=fontAntiAliasing:true;fontSize:12;forceLabels:on
>> </dct:references>
>>    <dct:references scheme="OGC:WMS">
>> http://localhost:8080/geoserver/geonode/wms</dct:references>
>>    <dct:references scheme="OGC:WFS">
>> http://localhost:8080/geoserver/geonode/wfs</dct:references>
>> ...
>>
>> (full XML here https://pastebin.com/Wu0vm79B)
>>
>> Seems to be good right? *Wrong!* There some important things missing here:
>>
>> 1. It is not possible to recognize the layer name at all; The element
>> "title" is mapped to the resource title, meaning that whenever I change it
>> on the metadata into a human readable fashion, I lose the layer name
>> forever
>>
>>
> You should use ISO instead?  See below comment.
>
> 2. Layer qualified name is missing; if the name had a namespace, like on
>> GeoServer, it is not possible to know which is at all
>>
>> 3. WMS and WFS links cannot be used at all, since the layer name cannot be
>> retrieved anywhere
>>
>>
> Anyone who wants to do tight coupling to OWS resources via CSW search
> workflows needs to use the ISO output, which provides the bare URL
> as well as the given Layer/FeatureType/Coverage.
>
> Otherwise, the Dublin Core approach allows for discovery followed by
> the client doing a full round trip (GetCapabilities, etc.) to be able
> to find the layer again.  This is not optimal, which is exactly why
> the CSW ISO Application Profile was created to help tight couplling
> workflows.
>
> If there are issues in the ISO output then let's tackle those?
>
>
>
> *Proposal*
>>
>> Following the notes written by Stephen Richard here
>> https://github.com/geopython/pycsw/wiki/Geonode-notes
>>
>> the proposal here would be to add more references
>>
>> OGC:WMS-1.1.1-http-get-capabilities
>> OGC:WMS-1.3.0-http-get-capabilities
>> OGC:WMS-1.1.1-http-get-map
>> OGC:WMS-1.3.0-http-get-map
>> OGC:WMS-1.1.1-http-get-featureinfo
>> OGC:WMS-1.3.0-http-get-featureinfo
>>
>> OGC:WFS-1.0.0-http-get-capabilities
>> OGC:WFS-1.0.0-http-describe-feature
>> OGC:WFS-1.0.0-http-get-feature
>>
>> OGC:WCS-1.1.0-http-get-capabilities
>> OGC:WCS-1.1.0-http-describe-coverage
>> OGC:WCS-1.1.0-http-get-coverage
>> ...
>>
>
> Note that we promoted this into a canonical lookup at:
>
> https://github.com/OSGeo/Cat-Interop/blob/master/LinkPropert
> yLookupTable.csv
>
>
>
>
>> in order to let CSW being able to send correct links to the clients.
>>
>> If there are no objections, I will create a PR accordingly related to the
>> following ISSUE
>>
>> https://github.com/GeoNode/geonode/issues/2720#issuecomment-262829872
>>
>> Please comment on this.
>>
>>
>> Regards,
>>
>> Alessio Fabiani
>>
>> ==
>> GeoServer Professional Services from the experts! Visit
>> http://goo.gl/it488V
>> for more information.
>> ==
>>
>> Ing. Alessio Fabiani
>>
>> @alfa7691
>> Founder/Technical Lead
>>
>>
>> GeoSolutions S.A.S.
>> Via di Montramito 3/A
>> 55054  Massarosa (LU)
>> Italy
>> phone: +39 0584 962313
>> fax:     +39 0584 1660272
>> mob:   +39 331 6233686
>>
>> http://www.geo-solutions.it
>> http://twitter.com/geosolutions_it
>>
>> -------------------------------------------------------
>>
>> AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
>>
>> Le informazioni contenute in questo messaggio di posta elettronica e/o
>> nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
>> loro utilizzo è consentito esclusivamente al destinatario del messaggio,
>> per le finalità indicate nel messaggio stesso. Qualora riceviate questo
>> messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
>> darcene notizia via e-mail e di procedere alla distruzione del messaggio
>> stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
>> divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
>> utilizzarlo per finalità diverse, costituisce comportamento contrario ai
>> principi dettati dal D.Lgs. 196/2003.
>>
>> The information in this message and/or attachments, is intended solely for
>> the attention and use of the named addressee(s) and may be confidential or
>> proprietary in nature or covered by the provisions of privacy act
>> (Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
>> Code).Any use not in accord with its purpose, any disclosure,
>> reproduction,
>> copying, distribution, or either dissemination, either whole or partial,
>> is
>> strictly forbidden except previous formal approval of the named
>> addressee(s). If you are not the intended recipient, please contact
>> immediately the sender by telephone, fax or e-mail and delete the
>> information in this message that has been received in error. The sender
>> does not give any warranty or accept liability as the content, accuracy or
>> completeness of sent messages and accepts no responsibility  for changes
>> made after they were sent or for other risks which arise as a result of
>> e-mail transmission, viruses, etc.
>>
>>
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