Tuesday, July 28, 2009

Re: [Geopriv] geo: URI: why crs=, andnotcrsURI=?

I think that your analysis was correct. WGS84 as specified doesn't directly map to one CRS URN, it maps to two. 4979 AND 4326, depending on the presence of altitude. Other definitions would need to deal with this.

That doesn't prevent the later addition of a CRSURN parameter, but I think that I'd be opposed to that as I was on this ;)

> -----Original Message-----
> From: geopriv-bounces@ietf.org [mailto:geopriv-bounces@ietf.org] On
> Behalf Of Alexander Mayrhofer
> Sent: Tuesday, 28 July 2009 10:05 AM
> To: Ivan Shmakov; geopriv@ietf.org
> Subject: Re: [Geopriv] geo: URI: why crs=, andnotcrsURI=?
>
> > With such a parameter, a sheer number of already defined CRS
> > becomes available for the use in the geo: URIs.
>
> Theoretically, yes. Practically, only if the definition of the CRS is
> crystal clear about everything that is required for URI semantics (see
> definitions of WGS-84 in the document).
>
> Another issue that bothers me is that the sheer number of defined CRSes
> would almost make it impossible to support all those CRSes - which
> would
> probably hurt interopability.
>
> Does anybody else have an opinion about this?
>
> Alex
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