I guess the epsg reserving that code makes sense... I think using some other
arbitrary code that is not currently reserved would be fine. I like Ben's
leet idea but it results in a code hard to remember. I guess if I had a
choice it would be 999999. I generally like that a bit better than using -1
since I find that often (like in postgis, and some other dbs') -1 is used to
say "no referecing system" or "unknown referencing system".
On Fri, Apr 29, 2011 at 5:34 AM, Andrea Aime
<[email protected]>wrote:
> On Thu, Apr 28, 2011 at 11:37 AM, Andrea Aime
> <[email protected]> wrote:
> > Hi,
> > some months ago I started a discussion on GeoServer devel about
> > adding support for a new EPSG code, EPSG:0.
>
> Unfortunately I'm having troubles following this thread since my POP server
> is down due to a fire in the hosting center, however I'm able to follow
> this partly on the Nabble archives:
>
> http://osgeo-org.1803224.n2.nabble.com/Adding-support-for-a-new-EPSG-code-EPSG-0-td6312618.html
>
> I see that both Ben and Christian voted it down though... with an
> invalid vote btw.
> Per our procedures everyone voting -1 has to provide an alternative, just
> saying
> "no" is not allowed:
>
> http://docs.geotools.org/latest/developer/guide/procedures/proposal.html#voting
>
> I understand the concern about using a reserved code, it was chosen anyways
> because EPSG never used anything below 2000 and it's the most practical
> solution, a code that everybody can remember and associate with its
> wildcard
> nature.
>
> Anyways, let's look at the alternatives. If we stick by EPSG
> recommendations
> we need a code above 32767. Can't find any code that can be easily
> associated
> with "wildcard cartesian" concept, but random easy to remember codes could
> be:
> 43234
> 99999
> 100000
> 100001
> 999999
>
> Another alternative is to go the other side and use EPSG:-1 instead.
> Looks like a disappointed smiley, pretty much fits with my
> feelings for not being able to use the simplest solution, and I guess also
> the one of people not being able to georeference their data.
> Nobody ever used negative numbers, so there is no possibility of a
> conflict.
>
> I don't think any system is prepared to deal with -1, at the same time I
> can't
> think of anyone explicitly disallowing negative codes.
>
> Btw, EPSG has two cartesian codes in the official database, but they are
> defined just as examples are are not really usable:
> http://www.spatialreference.org/ref/epsg/5806/
> http://www.spatialreference.org/ref/epsg/5807/
>
> Answering Ben's question, yes, whatever code we choose is going to be
> published in the capabilities, just like all other user defined codes in
> esri.properties are.
> WMS can be legitimately used also to serve non geoferenced data,
> we've seen users trying to publish CAD data (floor plans) or high
> resolutions
> imagery such as painting scans that do not have any referencing in
> the world, we need to give this people a code instead of having them
> contiously hijack 4326 for that purpose
>
> 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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