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Re: Working list of BP requirements identified during the SDW WG f2f

From: Joshua Lieberman <jlieberman@tumblingwalls.com>
Date: Tue, 17 Mar 2015 09:49:08 -0400
Cc: public-sdw-wg@w3.org
Message-Id: <D485EA33-FE84-42BA-91F0-67DEAEDB5AEC@tumblingwalls.com>
To: Frans Knibbe | Geodan <frans.knibbe@geodan.nl>

> 
> 
> But more importantly, I think we will have to decide not to view a requirement like 'there should be a best practice for minting URIs of spatial phenomena' as something we should busy ourselves with. I can think of no reason to see the URI minting problem as something that is inherently spatial, temporal or spatiotemporal. Besides that, there already are some good guidelines on minting URIs out there. 

It isnít necessarily a critical for a useful URI, but space-time is a domain and that suggests some value in organizing the URIís that explicitly reference features in it. Otherwise multiple unrelated URIís are created that resolve to the same location or feature with resultant overhead to assert their relationships. This is especially related to the use case for authoritative framework data.

> 
>> 1.8 The OGC URI scheme includes common CRS. Try http://www.opengis.net/def/crs/EPSG/0/4326 <http://www.opengis.net/def/crs/EPSG/0/4326> for example. I trust that one of the OGC people in the meeting mentioned this? 
> 
> I am fairly sure that this was mentioned, and if not it is good to see it mentioned here. Two things came up that indicate that we might want to go a step further: Firstly, the OGC reference systems do have URIs, but they are not dereferencable to data describing the reference systems. Secondly, it would be good to have some best practice for the description of reference systems in general, not just earth-based reference systems. 

Did you try clicking on the link above? It goes to an (XML) document defining the CRS.

> 
> I noticed an interesting parallel for time and space there: In both cases the regular reference systems are fairly well covered by standards (earth based reference systems for space, Gregorian calendar for time), but less common reference systems are not easy to use in a standardized way.

Generally the ďless commonĒ ones are complicated because they cover a wide range of complicated situations, such as the SEDRIS SRM (ISO/IEC 18026:2006). They are standardized, but used mostly when they canít be avoided. <>
> 
> Regards,
> Frans
> 
>> Simon
>> 
>> -----Original Message-----
>> From: Andrea Perego [mailto:andrea.perego@jrc.ec.europa.eu <mailto:andrea.perego@jrc.ec.europa.eu>] 
>> Sent: Monday, 16 March 2015 5:03 PM
>> To: SDW WG
>> Subject: Working list of BP requirements identified during the SDW WG f2f
>> 
>> Dear all,
>> 
>> I've extracted from the minutes of the BP deliverable group a preliminary list of requirements, concerning the discussed use cases (1-24).
>> 
>> You can find it on the wiki:
>> 
>> https://www.w3.org/2015/spatial/wiki/BP_Requirements <https://www.w3.org/2015/spatial/wiki/BP_Requirements>
>> 
>> Please have a look, and modify / extend it as you see fit.
>> 
>> Cheers,
>> 
>> Andrea
>> 
>> --
>> 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/ <https://ec.europa.eu/jrc/>
>> 
>> ----
>> The views expressed are purely those of the writer and may not in any circumstances be regarded as stating an official position of the European Commission.
>> 
>> 
> 
> 
> Frans Knibbe
> Geodan
> President Kennedylaan 1
> 1079 MB Amsterdam (NL)
> 
> T +31 (0)20 - 5711 347
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Received on Tuesday, 17 March 2015 13:49:42 UTC

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