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Re: Best Practice for encoding spatial coverage

From: Andrea Perego <andrea.perego@jrc.ec.europa.eu>
Date: Thu, 18 Jun 2015 02:03:00 +0200
Message-id: <CAHzfgWAoSuVu5EiZFBfza5ExO6LX3+Hb5Z=zzXsmp0eFGY3n4g@mail.gmail.com>
To: Peter Baumann <p.baumann@jacobs-university.de>
Cc: Frans Knibbe <frans.knibbe@geodan.nl>, Simon Cox <Simon.Cox@csiro.au>, SDW WG Public List <public-sdw-wg@w3.org>
Hi, Peter.

On Wed, Jun 17, 2015 at 1:14 PM, Peter Baumann
<p.baumann@jacobs-university.de> wrote:
> Hi Frans,
>
> again, this XML is just an _example_ showing the ingredients. Nobody says it
> must be XML! See my mail below: use RDF, JSON, or any other format to
> represent CRS + coordinates.
>
> Dublin Core - BTW, it's XML ;-) ) works on another level of metadata, here
> an example from Wikipedia (http://www.w3.org/wiki/DublinCore):
>
> <meta name="DC.Coverage.spatial" scheme="TGN" content="name=San Francisco
> (San Francisco county, California, United States)" /> <meta
> name="DC.Coverage.spatial" scheme="DCMIPOINT" content="name=San Francisco,
> CA, U.S.A.; east=237.5833; north=37.7667" />
>
> Hence, Dublin Core uses a _description_ rather than an exact _location_.
> AFAICS the requirement under discussion focuses solely on the issue of
> representing space (and likely time) exactly (that is: through coordinates).
> Inexact representation, as done here, is another requirement. On the side,
> note the missing CRS. In "European" coordinates, this might end up in the
> Pacific ocean ;-)

BTW, Dublin Core has also a dct:Box syntax encoding scheme, described here:

http://dublincore.org/documents/dcmi-box/

The syntax encoding schemes defined for dct:Box, dct:Point and
dct:Period have been discouraged quite a few years ago in favour of
the use of specific properties, that however are not defined in Dublin
Core. See, e.g., the examples provided here:

http://wiki.dublincore.org/index.php/User_Guide/Publishing_Metadata#dcterms:spatial

http://wiki.dublincore.org/index.php/User_Guide/Publishing_Metadata#dcterms:temporal

For more details about how spatial / temporal coverage is defined in
Dublin Core, and why, Makx Dekkers and Simon (Cox), who were involved
in that work, provided very enlightening explanations during a long
email conversation on "space and time" carried out by the LOCADD CG -
see:

https://www.w3.org/community/locadd/wiki/Space_and_Time#Space_and_time_in_Dublin_Core

Cheers,

Andrea

----
[1]https://joinup.ec.europa.eu/node/139283/
[2]https://webgate.ec.europa.eu/CITnet/stash/projects/ODCKAN/repos/iso-19139-to-dcat-ap/
Received on Thursday, 18 June 2015 00:03:50 UTC

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