Oracle Spatial assigns 999999 srid code to unknown CRS as far as I know;
it's ugly but already used by someone as a convention.

-------------------------------------------------------
Ing. Alessio Fabiani
Founder / CTO GeoSolutions S.A.S.

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054  Massarosa (LU)
Italy

phone: (+39) 0584 96.23.13
fax:     (+39) 0584 96.23.13
mobile:(+39) 331 62.33.686

http://www.geo-solutions.it
http://geo-solutions.blogspot.com
http://www.linkedin.com/in/alessiofabiani
http://twitter.com/geosolutions_it
-------------------------------------------------------


On Fri, Apr 29, 2011 at 7:31 PM, Justin Deoliveira <jdeol...@opengeo.org>wrote:

> 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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>
>
>
> --
> Justin Deoliveira
> OpenGeo - http://opengeo.org
> Enterprise support for open source geospatial.
>
>
>
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