[Proj] Coordinate change transforming to EPSG:4326

[Cuinet Jérôme]

23029, it's better :D, the understanding name is ED50 / UTM zone 29N

And when you say ED50 and WGS84, I will answer datum shift. Datum shift has 
a trac ticket http://trac.osgeo.org/proj/ticket/32 and for extrem west 
europa the CoordinateTransformation EPSG code is 1145.

But the shift only on latitude coordinate is weird. Also, as you have the 
same results with Proj 4.4.6 and Proj 4.6.1, and a various result with Proj 
4.6.1 the problem should be with PostGIS !

Have you tried another conversion software in order to compare these results 
?

----- Original Message ----- 
From: "Miguel R. Luaces" <miguelrluaces at gmail.com>
To: "PROJ.4 and general Projections Discussions" <proj at lists.maptools.org>
Sent: Thursday, May 28, 2009 9:39 AM
Subject: Re: [Proj] Coordinate change transforming to EPSG:4326


Dear Jérôme,

sorry, I meant EPSG:23029

Best regards,
  Miguel

On Wed, May 27, 2009 at 8:13 PM, Cuinet Jérôme <jerome at georezo.net> wrote:

> I have snooped EPSG:23209 definition and I haven't found any definition.
>
> What is this coordinate system ?
>
>
>
> Jérôme
> ----- Original Message -----
> From: "Miguel R. Luaces" <miguelrluaces at gmail.com>
> To: <proj at lists.maptools.org>
> Sent: Tuesday, May 26, 2009 6:03 PM
> Subject: [Proj] Coordinate change transforming to EPSG:4326
>
>
> > Dear all,
> >
> > I am using proj.4 as part of PostGIS. Version 1.3.1 of postgis included
> > PRO
> > Rel. 4.5.0, whereas version 1.36 includes PROJ Rel. 4.6.1
> >
> > When I transform a coordinate from EPSG:23209 to EPSG:4326 I get the
> > following results.
> >
> > In Postgis 1.3.1 (PROJ.4 Rel. 4.5.0):
> >
> > "POINT(549556.009066526 4801796.3531214)";"POINT(-8.38839299999999
> > 43.3657910268222)"
> >
> > In Postgis 1.3.6 (PROJ Rel. 4.6.1):
> >
> > "POINT(549556.009066526 4801796.3531214)";"POINT(-8.38839299999999
> > 43.3666118995462)"
> >
> > The second coordinate of the transformation to 4326 changes by 0.004
> > degrees
> > (approx).
> >
> > If I use cs2cs from command line (version proj446_win32), I get:
> >
> > -8.38839300     43.36661190
> >
> > Why do I get a different result in postgis 1.3.1 and in postgis 1.3.6?
> >
> > Why do I get the same result in PROJ4 4.4.6?
> >
> > I do not understand. I hope anybody can help me.
> >
> > Best regards,
> >  Miguel
> >
>
>
>
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