[Proj] ERROR 6: No translation for Double_Stereographic to PROJ.4 format is known.

[OvV_HN]

I can look up some official test points in my files, including references to 
more or less authoritative sources. Will take a few days, around Sunday 
perhaps.
The latest versions of the RDNAP software (Netherlands) indeed do grid 
interpolation.
The Dutch Kadaster has/had an on-line transformation tool without grid 
interpolation, but with Schreiber polynomials, including a small error 
however.
Prince Edward test points are described in a Technical Report (no. 48 I 
believe).
Romanian test points can be obtained from a Hungarian Excel application by 
Gábor Timár.


Oscar van Vlijmen


----- Original Message ----- 
From: "Frank Warmerdam" <warmerdam at pobox.com>
To: "PROJ.4 and general Projections Discussions" <proj at lists.maptools.org>
Sent: Tuesday, March 31, 2009 9:27 PM
Subject: Re: [Proj] ERROR 6: No translation for Double_Stereographic to 
PROJ.4 format is known.


> OvV_HN wrote:
>> I don't get it. I always thought the existing PROJ (and libproj) function
>> sterea was a full implementation of the double stereographic projection,
>> suited for Dutch RD, New Brunswick / Prince Edward Island stereo and
>> Romanian Stereo 70.
>
> Oscar,
>
> Well, that is possible.  Is someone willing to do some leg work confirming
> if that is the case, and documenting the correct formulation of the
> coordinate systems described in http://trac.osgeo.org/gdal/ticket/2487
> for PROJ.4?  Some sample test points would also be helpful.  Given that
> I would be happy to update GDAL to support double stereographic and
> update some other resources.