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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