[Geopriv] RE: CRS URN

"Martin Thomson" <martin.thomson@nortel.com> Sun, 17 July 2005 23:21 UTC

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From: "Martin Thomson" <martin.thomson@nortel.com>
To: Carl Reed OGC <creed@opengeospatial.org>
Date: Mon, 18 Jul 2005 09:20:53 +1000
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Cc: 'GEOPRIV' <geopriv@ietf.org>
Subject: [Geopriv] RE: CRS URN
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Hi Carl,

I'm sorry, I have to rise to the bait on this one.  It's been bugging me.

>     <gml:Point gml:id="point96" 
srsName="http://www.opengis.org/CRScatalogue.xml#epsg_4326">
>       <gml:pos>33.001111  96.68142</gml:pos>
>     </gml:Point>

Can someone please standardize:

    urn:ogc:def:crs:EPSG:6.6:4326
    http://www.opengis.org/CRScatalogue.xml#epsg_4326
    urn:ogc:def:crs:EPSG:4326:6.6
    urn:EPSG:geographicCRS:4326
    epsg:4326
    http://www.opengis.net/gml/srs/epsg.xml#4326
    www.epsg.org#4326
    urn:epsg:v6.6:coordinateReferenceSystem:4326
    urn:ogc:def:crs:OGC:1.3:CRS84

All of these have been taken from standards body publications.  It would be
nice to only have to deal with one, maybe two URNs; 4326 for 2D, 4979 for
3D.

PIDF-LO profile recommends the first, since that is published in OGC 05-010;
but now I see yet another.  Carl, are we right in using
"urn:ogc:def:crs:EPSG:6.6:4326"?  Can we expect to see more forms in the
future? In other words, is there a need to do more than specify a common
form and define a pattern, or means of parsing the URN?

Cheers,
Martin

p.s.
>    <gml:location>

Incidentally, I thought that the location element was deprecated.
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