>>>>> Ivan Shmakov <oneingray...> writes: >>>>> Michael Ströder <michael...> writes: >>>>> Ivan Shmakov wrote: >>>>> Michael Ströder <michael...> writes:
[...] >>>> for all the coordinate systems and encourage people to register >>>> their coordinate systems. >>> This could be the easiest part, as there're already developed >>> ``vocabularies'' of coordinate systems. In particular, I believe >>> WKT [1] uses one. >>> [1] http://en.wikipedia.org/wiki/Well-known_text >> I'm not familiar with this stuff but it's good to rely on existing >> and well-maintained registries. > Yes. ... The discussion [2] in the geop...@... mailing list has revealed a couple of such registries [3, 4]. In particular, URNs of the form: urn:ogc:def:crs:epsg::NUMBER seem to be often used as coordinate systems' identifiers in GML. > [1] http://en.wikipedia.org/wiki/Well-known_text [2] http://www.ietf.org/mail-archive/web/geopriv/current/msg07666.html [3] http://www.epsg-registry.org/ [4] http://urn.opengis.net/ -- FSF associate member #7257
