[postgis-users] Question on transform.

[Paul Ramsey]

Luis,
You can confirm on the proj4 mailing list (try this out using the proj4 
commandline tools) but my understanding is that proj4 mostly ignores 
geogcs transforms. There are a few exceptions to this rule, but it is 
mostly true, since proj4 was originally written without any geogcs 
transform support at all. The support which is there was retrofitted in 
later by Frank Warmerdam.
Frank can correct me, of course... :)
Paul

Luis Mota wrote:
> Hi everyone.
> 
> I've been using the transform function, but I have some surprising 
> results...
> 
> For instance, if I issue the following query:
> 
> select transform(geomfromtext('POINT(0 38)',4803),4326);
> 
> the result I get is:
>       transform      -----------------------
> SRID=4326;POINT(38 0)
> (1 row)
> 
> ie, exacly the same point... This is obviously wrong, since the two 
> GEOGCS's are different. For instance, the prime meridian is different..
> 
> Is it possible that I have some instalation problem? Was this a bug 
> corrected in a later version?
> 
> Thanks for any help.
> 


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      | Paul Ramsey
      | Refractions Research
      | Email: pramsey at refractions.net
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