I am fine with all these options but my preference is the same as Andreas.
That is:

1. EPSG:0
2. EPSG:-1
3. EPSG:99999

If epsg does map 0 to some other crs we can always revisit that later and
change the definition in the next major release.

2c.

-Justin

On Fri, Apr 29, 2011 at 11:15 AM, Andrea Aime
<andrea.a...@geo-solutions.it>wrote:

> Hi,
> restarting the thread summing up what we have so far.
>
> Objective: we want a code to represent cartesian data
> such as floor plans and photos and the like.
>
> Options:
>
> - EPSG:0
>  pro: easy to remember
>        clients are supposed not to bomb out on it (valid range)
>  cons: reserved code, people voted it down with -1
>
> - EPSG:-1
>  pro: easy to remember
>        not a reserved code
>  cons: will all clients accept it? Dunno....
>
> - EPSG:99999
>  pro: not a reserved code
>         in the official set of user codes
>  cons: nobody will remember it means "cartesian generic"
>
> Not happy with any of them but given all the options I would
> still go for EPSG:0 taking the risk that EPSG would one day
> use it (which I believe is really unlikely).
>
> Second choice would be -1, with the quick that I have no
> way to test some common clients like ArcGis.
> Last one 99999, seems too ugly to be true to me...
>
> Cheers
> Andrea
>
> --
> -------------------------------------------------------
> Ing. Andrea Aime
> GeoSolutions S.A.S.
> Tech lead
>
> Via Poggio alle Viti 1187
> 55054  Massarosa (LU)
> Italy
>
> phone: +39 0584 962313
> fax:      +39 0584 962313
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.youtube.com/user/GeoSolutionsIT
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
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>
>
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-- 
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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