Re: [Wikidata] upcoming change in RDF format data

[Ghislain ATEMEZING]

Hi Stas,
+1 for the changes. I believe the reason is not only for the WKT
representation, but also to follow the current publication practices of
geodata out thre on the Web.
Two examples in DBpedia and LinkedGeoData:
- http://dbpedia.org/resource/Seattle with the geo:geometry property.
- http://linkedgeodata.org/page/triplify/node29546940 with the property
ogc:asWKT (http://linkedgeodata.org/page/geometry/node29546940)

I guess there are other properties in the Wikidata RDF dataset that just
retrieve lat or long alone.

Best,
Ghislain

El dom., 3 abr. 2016 a las 10:11, Stas Malyshev ()
escribió:

> Hi!
>
> We are committing a patch that implements a change in RDF format output,
> specifically how we output coordinates as WKT points.
>
> If you do not use RDF format exports and specifically WKT coordinate
> literals there, this change has no effect for you.
>
> When we first implemented it, we chose to make it "Point(latitude
> longitude)". Unfortunately, turns out the standard way in WKT is
> Point(longitude latitude) and that's how most of the tools that
> implement WKT format understand it. In general, geo-data formats are
> split on this question, see http://www.macwright.org/lonlat/. But WKT is
> pretty universally in lon-lat camp, so we have to follow the established
> practice.
>
> As such, we are changing the WKT representation and we are bumping the
> format version (reported as schema:softwareVersion on RDF dumps/exports)
> from 0.0.1 to 0.0.2 so that the tools could adjust properly.
>
> See more details in: https://phabricator.wikimedia.org/T130049
>
> Thanks,
> --
> Stas Malyshev
> smalys...@wikimedia.org
>
> ___
> Wikidata mailing list
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[Wikidata] upcoming change in RDF format data

[Stas Malyshev]

Hi!

We are committing a patch that implements a change in RDF format output,
specifically how we output coordinates as WKT points.

If you do not use RDF format exports and specifically WKT coordinate
literals there, this change has no effect for you.

When we first implemented it, we chose to make it "Point(latitude
longitude)". Unfortunately, turns out the standard way in WKT is
Point(longitude latitude) and that's how most of the tools that
implement WKT format understand it. In general, geo-data formats are
split on this question, see http://www.macwright.org/lonlat/. But WKT is
pretty universally in lon-lat camp, so we have to follow the established
practice.

As such, we are changing the WKT representation and we are bumping the
format version (reported as schema:softwareVersion on RDF dumps/exports)
from 0.0.1 to 0.0.2 so that the tools could adjust properly.

See more details in: https://phabricator.wikimedia.org/T130049

Thanks,
-- 
Stas Malyshev
smalys...@wikimedia.org

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