[mapserver-users] Projection EPSG code for LCC in mapserv 3.5

[Paul Ramsey]

This dependence on the EPSG authority has got to be the worst aspect of
the WMS spec. There are scads of useful (and widely used!) projections
which EPSG does not have codes for. So now people are just randomly
adding codes willy nilly. ESRI has already done so, in their
"predefined" projections provided with ArcGIS8. They took the EPSG list,
dropped a few projections, and then added a bunch of new ones of their
own. I can send a proj4-style epsg file with the ESRI-added codes to
anyone who needs it. 

What I do not understand is why the WMS spec does not support WKT as a
means of defining projection information in the first place. Ironically,
ArcIMS *does* support WKT for defining projection information. 

Daniel Morissette wrote:
> 
> > Trem Stamp wrote:
> >
> > Does anyone know if there is an EPSG code for LCC projection
> > information?  I seem to remember looking last time and couldn't fine
> > one so had to use the following type of syntax:
> >
> >   PROJECTION
> >   "proj=lcc"
> >   "ellps=aust_SA"
> >   "lat_0=-32.5"
> >   "lon_0=147.0"
> >   "lat_1=-29.5"
> >   "lat_2=-36.5"
> >   END
> >
> > If there is no EPSG code for this currently, does anyone know if there
> > is likely to be in the near future?
> >
> 
> Trem,
> 
> We ran into the same issue for Canadian LCC projections... there wasn't
> any in the official list of EPSG codes.  But you can edit the
> /usr/local/share/proj/epsg file to add your own codes... that's what we
> ended up doing... read on...
> 
> Cubewerx which is actively involved in all that WMS stuff had also run
> into this issue and resolved it by defining its own extension to the
> EPSG list for LCC and other projections useful to canadians.  They used
> custom EPSG codes in the range 42100-42399.  We adopted the same codes
> for our own WMS implementations and added (some of) them to our local
> "epsg" file, so our clients and servers can exchange LCC projection with
> other servers that also adopted Cubewerx's EPSG extension.
> 
> Question to Frank W: Do you think the 42100-42399 custom EPSG codes
> could be added to the official "epsg" file distributed with PROJ4?
> 
> Now, I realize that this doesn't resolve your problem with Australian
> projections not having an EPSG code... I think you should raise this
> issue on the WMS-Dev list and see if a better solution to this problem
> has been adopted.
> (See http://www.intl-interfaces.net/mailman/listinfo/wms-dev)
> 
> --
> ------------------------------------------------------------
>  Daniel Morissette               morissette at dmsolutions.ca
>  DM Solutions Group              http://www.dmsolutions.ca/
> ------------------------------------------------------------
>   Don't put for tomorrow what you can do today, because if
>       you enjoy it today you can do it again tomorrow.