[ckan-dev] CSW, ISO and Spatial Extension

Mon Oct 29 08:48:25 UTC 2012

Hi all,

we are also working on the CSW harvester for the German Open Data
Portal. We need to import geo-related ISO191xx metadata from several CSW
servers, including geonetworks. The two key challenges are filtering the
fraction of records that has proper resource+license and transforming
into CKAN-package format. But instead of general CKAN metadata we want
to procude packages that conform the the German Open Gov Data metadata
json-schema:
https://github.com/fraunhoferfokus/ogd-metadata

We'll feed our questions, code and findings into this list and
https://github.com/okfn/ckanext-spatial .

Looking forward to collaborating on this, best regards,

FLO

On 25.10.12 18:50, Ryan Clark 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 <mailto:ryan.clark at azgs.az.gov>
> (520) 302-4871
> 
> 
> 
> 
> 
> 
> 
> 
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