[Mapserver-dev] EPSG:NONE

[Ed McNierney]

Tom -

Thanks for the reference!  The specification seems to say that the
correct implementation is "SRS=NONE", not "SRS=EPSG:NONE", which makes
perfect sense (the keyword NONE is not case-sensitive), and that this
value *shall* be used for data whose spatial reference is undefined.
The EPSG: prefix should be reserved for valid EPSG codes, and it sounds
like (a) MapServer should support the SRS=NONE parameter and (b) PCI
should fix their software to comply with the spec.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com
ed at topozone.com


-----Original Message-----
From: Tom Kralidis [Burlington] [mailto:Tom.Kralidis at ec.gc.ca] 
Sent: Wednesday, November 19, 2003 11:43 AM
To: Ed McNierney; Frank Warmerdam; mapserver-dev at lists.gis.umn.edu
Subject: RE: [Mapserver-dev] EPSG:NONE


> -----Original Message-----
> From: Ed McNierney [mailto:ed at topozone.com] 
> Sent: Wednesday, November 19, 2003 11:41 AM
> To: Tom Kralidis [Burlington]; Frank Warmerdam; 
> mapserver-dev at lists.gis.umn.edu
> Subject: RE: [Mapserver-dev] EPSG:NONE
> 
> 
> Frank & Tom -
> 
> Does either EPSG or OGC have anything to say about this?  The 
> support is a good in concept, but I don't want to start 
> propagating a particular specification simply because we 
> discovered one vendor using it.
> 

This is noted in the WMS 1.1.1 specification (section 6.5.5.3).

..Tom


> 	- Ed
> 
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com
> ed at topozone.com
> 
> 
> -----Original Message-----
> From: Tom Kralidis [Burlington] [mailto:Tom.Kralidis at ec.gc.ca] 
> Sent: Wednesday, November 19, 2003 10:53 AM
> To: 'Frank Warmerdam'; mapserver-dev at lists.gis.umn.edu
> Subject: RE: [Mapserver-dev] EPSG:NONE
> 
> 
> 
> > -----Original Message-----
> > From: Frank Warmerdam [mailto:warmerdam at pobox.com]
> > Sent: Wednesday, November 19, 2003 10:45 AM
> > To: mapserver-dev at lists.gis.umn.edu
> > Subject: [Mapserver-dev] EPSG:NONE
> > 
> > 
> > Folks,
> > 
> > Have you ever encountered anything about EPSG:NONE being a
> > valid way of describing a coordinate system not related to 
> > the earth?  I see a PCI server is using this convention and I 
> > am wondering if MapServer should somehow be made to support 
> > it or not.  A clients application copies the EPSG strings 
> > into new mapfiles when using the MapServer WMS client support.
> > 
> 
> I say support it.  EPSG:NONE is good for images which are not
> necessarily
> spatial.  Like old maps, charts, etc.  The PCI software allows one to
> output
> projects as WMS layers (map, legend, chart, other info) in one bundle.
> Not
> really for fusion w/ other data, yet a bundled approach.
> 
> ..Tom
> 
> > Best regards,
> > 
> > -- 
> > ---------------------------------------+----------------------
> > ----------
> > ---------------------------------------+------
> > I set the clouds in motion - turn up   | Frank Warmerdam, 
> > warmerdam at pobox.com
> > light and sound - activate the windows | http://pobox.com/~warmerdam
> > and watch the world go round - Rush    | Geospatial 
> > Programmer for Rent
> > 
> > 
> > _______________________________________________
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> > Mapserver-dev at lists.gis.umn.edu 
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> > 
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