[Proj] PROJ 4.6.0 beta1 Release
bfraser at geoanalytic.com
Thu Nov 29 16:59:52 EST 2007
Sounds like a good idea, but will the API return a code,
or through some other mechanism, indicate that a datum
transformation has not occured? The application could then
alert the user...
----- Original Message -----
From: "Frank Warmerdam" <warmerdam at pobox.com>
To: "PROJ.4 and general Projections Discussions"
<proj at lists.maptools.org>
Sent: Thursday, November 29, 2007 2:44 PM
Subject: [Proj] PROJ 4.6.0 beta1 Release
> There have been many complaints from folks about
> doing "ellipse to ellipse" datum shifts when no datum
> is available. I have come to the, belated, conclusion
that the idea will
> ill conceived on my part, and I have reversed my approach.
> Now, if pj_datum_transform() (called pj_transform()) is
> either of the coordinate system lacks datum information it
will apply no
> datum shift at all. The lat/long coordinates will be
taken from one
> and applied on the other with alteration.
> Datum shift information can be specified two ways, a
> or a +nadgrids parameter. The +datum parameter is
basically for named
> aliases that expand to +ellps and either +nadgrids or
> This is a major behavior change, and I'd appreciate folks
giving some feedback
> on the change. I have prepared a first beta release with
> designated 4.6.0 beta1.
> This release also includes an upgrade to EPSG 6.14 and a
few other relatively
> minor bug fixes.
> Best regards,
> I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam at pobox.com
> light and sound - activate the windows |
> and watch the world go round - Rush | President OSGeo,
> Proj mailing list
> Proj at lists.maptools.org
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