Re: Geo-DCAT application profile

Hi Andrea

Many thanks for the detailed response - and sorry that I hadn't kept up
with everything the SDW group had already done in considering GeoDCAT-AP!

I'll follow up on the various links in your mail.

Best regards

Bill



On 17 May 2016 at 10:10, Andrea Perego <andrea.perego@jrc.ec.europa.eu>
wrote:

> Hi, Bill.
>
> I've actually chaired the GeoDCAT-AP WG, who released the final version of
> the specification (1.0) last December:
>
>
> https://joinup.ec.europa.eu/asset/dcat_application_profile/asset_release/geodcat-ap-v10
>
> Its XSLT implementation, the related API and additional documentation are
> available from:
>
>
> https://webgate.ec.europa.eu/CITnet/stash/projects/ODCKAN/repos/iso-19139-to-dcat-ap/
>
> GeoDCAT-AP is already included in the SDW UCR document (Section 4.42), and
> there's also a placeholder in the BP.
>
> In July 2015, I've shared an outline of the work done possibly relevant to
> the SDW WG:
>
> https://lists.w3.org/Archives/Public/public-sdw-wg/2015Jul/0082.html
>
> I take this opportunity to summarise below what has happened afterwards:
>
>
> GEOMETRIES / BOUNDING BOXES
>
> No news. The approach is still the one reported in the following mail:
>
> https://lists.w3.org/Archives/Public/public-sdw-wg/2015Jun/0167.html
>
> As said there, the adopted solution highlighted the lack of an agreed way
> in RDF of specifying that a geometry is a bounding box (or a centroid,
> etc.).
>
>
> REFERENCE SYSTEMS
>
> The modelling of reference systems in GeoDCAT-AP reflects how this
> information is specified in ISO 19115, as I mentioned here:
>
> https://lists.w3.org/Archives/Public/public-sdw-wg/2016Apr/0061.html
>
> Basically, a reference system is denoted both as a dct:Standard and as a
> skos:Concept, linked to the reference register by using skos:inScheme.
> Moreover, dct:type is used to specify whether it is a spatial or temporal
> reference system, by using the relevant terms (skos:Concept's) from the
> glossary of the INSPIRE Registry.
>
> For instance, this could be a description of EPSG:32630:
>
> <http://www.opengis.net/def/crs/EPSG/0/32630>
>     a dct:Standard, skos:Concept ;
>     dct:type <http://inspire.ec.europa.eu/glossary/SpatialReferenceSystem>
> .
>     dct:identifier "http://www.opengis.net/def/crs/EPSG/0/32630"^^xsd:anyURI
> ;
>     skos:prefLabel "WGS 84 / UTM zone 30N"@en ;
>     skos:inScheme <http://www.opengis.net/def/crs/EPSG> .
>
> <http://www.opengis.net/def/crs/EPSG>
>     a skos:ConceptScheme ;
>     dct:title "EPSG coordinate reference systems"@en .
>
> dct:conformsTo is used to specify the reference system(s) used in a given
> dataset.
>
> The description above is not addressing some of issues discussed by the WG
> back in May 2015 - e.g., how to specify the axis order [1] - but it could
> be a starting point. E.g., for temporal reference systems, it can be
> complemented with the relevant terms in the recent version of the Time
> Ontology prepared by Simon - I'm thinking, in particular, to time:TRS and
> time:hasTRS.
>
>
> SPATIAL RESOLUTION
>
> Recent discussion with the DWBP WG led to a possible solution, based on
> the Data Quality Vocabulary. The thread starts at:
>
> https://lists.w3.org/Archives/Public/public-sdw-comments/2016Mar/0007.html
>
> The relevant section of the DQV specification is 5.13 (ED on GH):
>
> http://w3c.github.io/dwbp/vocab-dqg.html#ExpressDatasetAccuracyPrecision
>
>
> DATA QUALITY
>
> This is just indirectly related to SDW. However, there was some discussion
> with the DWBP WG on how to express conformance test results and conformance
> levels in DQV. This was a long thread, started in August 2015 [2]. The
> current situation is described in the following message from Antoine Isaac:
>
> https://lists.w3.org/Archives/Public/public-dwbp-wg/2016Apr/0079.html
>
>
> Cheers,
>
> Andrea
>
> ----
> [1]https://lists.w3.org/Archives/Public/public-sdw-wg/2015May/0084.html
> [2]https://lists.w3.org/Archives/Public/public-dwbp-wg/2015Aug/0146.html
>
>
> On 14/05/2016 19:09, Bill Roberts wrote:
>
>> Hi all
>>
>> An EU group is working on 'Geo DCAT' - an extension/profile of DCAT for
>> describing geographical datasets - and related to EU INSPIRE standards.
>>
>> https://joinup.ec.europa.eu/node/139283/
>>
>> Anyone in the SDW group closely involved in this?  Obviously there is
>> some overlap with some of our metadata related best practices.
>>
>> Latest working draft downloadable here:
>>
>>
>> http://joinup.ec.europa.eu/site/dcat_application_profile/GeoDCAT-AP/GeoDCAT-AP_2015-10-12_7th_WG_Draft/
>>
>> Should we be engaging with this group?  Do we want to take account of
>> their (draft) recommendations?
>>
>> Cheers
>>
>> Bill
>>
>
> --
> Andrea Perego, Ph.D.
> Scientific / Technical Project Officer
> European Commission DG JRC
> Institute for Environment & Sustainability
> Unit H06 - Digital Earth & Reference Data
> Via E. Fermi, 2749 - TP 262
> 21027 Ispra VA, Italy
>
> https://ec.europa.eu/jrc/
>