[ckan-dev] CSW, ISO and Spatial Extension

Sun Oct 28 11:28:05 UTC 2012

Hi,

As stated previously on this list, we are soon going to start work 
integrating CKAN with pycsw, which is a full CSW implementation in 
python (http://www.pycsw.org).
We released version 1.4.0 in September and we now fully support wsgi.

Best,
Angelos

On 10/27/2012 10:56 PM, Bruce Crevensten wrote:
> Hi Ryan,
>
> Our organization has a similar set of concerns regarding ISO19139 /
> ISO19115.  We're currently using GeoNetwork, which is excellent for
> schema-based metadata but presents some challenges regarding low-friction
> integration into our other applications.  I've been investigating using
> CKAN to harvest records from GeoNetwork via CSW; we can then leverage
> CKAN's user interface for content management (adding custom fields) and use
> its data API to integrate with custom apps while leaving the more
> structured, schema-based work to GeoNetwork.
>
> I've successfully performed a harvest, and my next step is to drill down on
> how CKAN mapped the fields from GeoNetwork into its own key/value store.
>   Most things came through fine, and other gaps are either due to our
> imperfect use of the ISO19115 standard or, perhaps, areas where the
> harvester could be tuned.  I'm still investigating, and due to other
> project assignments, I regret that I may not be able to post outcomes from
> this for some time.  When I have progress to report, I'll post it here.
>
> While the GeoNetwork / CKAN integration may not make sense in other
> environments, I just wanted to let you know there's other folks out there
> that have a similar set of concerns, and it'd be great if you posted how
> you solved (or explored) the problem.
>
> Regards,
> - Bruce
>
> On Thu, Oct 25, 2012 at 8:50 AM, Ryan Clark <ryan.clark at azgs.az.gov> wrote:
>
>> Hi!
>>
>> I'm in the process of evaluating CKAN's potential for use in a distributed
>> data system for geothermal information that is being built in the US. A
>> fundamental component of our project is the concept of a catalog which
>> contains standardized metadata describing distributed data resources across
>> the web. At that level, CKAN seems like a very nice fit!
>>
>> We are committed to providing metadata according to a custom profile for
>> ISO 19139, and to implementing a CSW interface. I've started by playing
>> with the spatial, harvest, and csw extensions, which are clearly undergoing
>> significant development currently -- I see that they've all been merged
>> into one extension as of last week! What I found was that while the CSW
>> interface responds to queries, it does not expose any of the resources that
>> I had published in my development environment -- GetRecords and
>> GetRecordByID never return anything.
>>
>> While I'm new to SQLalchemy, spatial.controllers.csw:GetRecords looks to
>> me like it is configured to only return records that were brought into the
>> catalog via a harvest mechanism. Is this true?
>>
>> If so, that brings up what I suspect is the primary issue I would have to
>> deal with in order to implement CKAN -- I suspect that there would need to
>> be a mapping from CKAN's "internal metadata model" (basically the package
>> table) into XML records that can be exposed via CSW. It is also likely that
>> in order to generate a complete ISO 19139 record might require some
>> additional content in the internal model.
>>
>> Does this sound like I'm on the right track? Is there any existing pattern
>> for doing this kind of translation where I might start looking for guidance?
>>
>> Thanks!
>>   ____________________
>>
>> Ryan Clark
>> ryan.clark at azgs.az.gov
>> (520) 302-4871
>>
>>
>>
>>
>>
>>
>>
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>>
>
>
>
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-- 
Angelos Tzotsos
Remote Sensing Laboratory
National Technical University of Athens
http://users.ntua.gr/tzotsos

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