[wms-dev] Re: [mapserver-users] Projection EPSG code for LCC in mapserv 3.5

[Martin Daly]

> "Martin Daly" <martin at cadcorpdev.co.uk> wrote:
>
> > My understanding was that using "EPSG:xxxx" was a pragmatic solution to
a
> > complex problem.  GML 3.0 will have XML encoding of co-ordinate
reference
> > systems (much more powerful than existing WKT), and support for CRS
> > dictionaries, e.g. for on-line repositories containng CRS definitions
that
> > can be referenced with a URI.
>
> Does it provide a mechanism for a server to describe what datums and
> projections are available so that a client can construct arbitrary
> parameterizations?

The last GML 3.0 schemas that I looked at had support for dictionaries of
Datums, Ellipsoids, Prime Meridians, and CRS-s, but not for the other
building-blocks that you would need, e.g. Transformations.  I have no idea
why this particular subset was chosen, but I'm sure that someone will.

Regards,
Martin Daly,
Technical Director,
Cadcorp Ltd
e: martin at cadcorpdev.co.uk
w: www.cadcorp.com
t: +44 (0) 20 7383 0014
f: +44 (0) 20 7388 6313