Re: UCR work today

Hi Alejandro,

In working through the PB requirements I passed this one:

"There should be a standard for publishing data about coordinate reference
systems (CRS) - Not only geographical reference systems."

I see there already is a CRS requirement (CRS Definition
<http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#CRSDefinition>),
from the SSN requirements. Do you think we can merge the two? I spot some
differences:


   1. The SSN requirement implies that a CRS needs to have a URI. Let's
   assume that is a HTTP URI. I have the feeling that a solution (use HTTP
   URIs) is already worked into the requirement (a standard for identifying a
   URI).
   2. the PB requirement implies that not only identification of CRSs
   should be standardised, but getting the data that describe the CRS too.
   3. The PB requirement explicitely is about non-geographical CRSs too -
   not a conflict, but a broader scope.
   4. if the SSN requirement indeed is only about identification of a CRS,
   indeed it seems to be covered by the spatial metadata requirement
   <http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#SpatialMetadata>.
   But perhaps there is a difference: the SSN requirement says "The URI of the
   Coordinate Reference System (CRS) shall be specified...". So perhaps it is
   saying that there should be a strong recommendation not to publish spatial
   data without a CRS, while the BP requirement is mainly about having the
   option of specifying a CRS?

Regards,
Frans



2015-04-28 13:52 GMT+02:00 Alejandro Llaves <allaves@fi.upm.es>:

> Hi Frans,
>
> thanks for the info. I am travelling today to Lisbon for a project meeting
> and will not be able to attend tomorrow's telecon (cc'ed Phil, Kerry, and
> Ed). I will have more time to spend on the UCs document from next week on
> wards.
>
> Best regards,
> Alejandro
>
> On 28 April 2015 at 12:37, Frans Knibbe <frans.knibbe@geodan.nl> wrote:
>
>> Hello Alejandro,
>>
>> I will start working on the UCR document today, particularly the
>> requirements for the Best Practices deliverable.
>>
>> Regards,
>> Frans
>>
>> --
>> Frans Knibbe
>> Geodan
>> President Kennedylaan 1
>> 1079 MB Amsterdam (NL)
>>
>> T +31 (0)20 - 5711 347
>> E frans.knibbe@geodan.nl
>> www.geodan.nl
>> disclaimer <http://www.geodan.nl/disclaimer>
>>
>>
>
>
> --
> Alejandro Llaves
>
> Ontology Engineering Group (OEG)
>
> Artificial Intelligence Department
>
> Universidad Politécnica de Madrid
>
> Avda. Montepríncipe s/n
>
> Boadilla del Monte, 28660 Madrid, Spain
>
>
> http://www.oeg-upm.net/index.php/phd/325-allaves
>
>
> allaves@fi.upm.es
>



-- 
Frans Knibbe
Geodan
President Kennedylaan 1
1079 MB Amsterdam (NL)

T +31 (0)20 - 5711 347
E frans.knibbe@geodan.nl
www.geodan.nl
disclaimer <http://www.geodan.nl/disclaimer>