Jeremy, Unfortunately I do not automatically pickup references to grid shift files from the EPSG database. To the extent these are supported it is accomplished by special hackery. In fact skimming the epsg file, I think the only datum for which grid shift files are used *by default* is NAD27. Perhaps this would be a good time for me to review how to utilize at least the grid shift files we are distributing with PROJ.4 like ntf_r93.gsb and nzgd2kgrid0005.gsb.
Hmm, I am getting the impression that nzgd2kgrid0005.grd is actually the transformation between NZGD2000 and WGS84 and that we would actually need another file - possibly something like Nzgd49ToNzgd2K.gdc to support NZGD1949 - is that right? I'd suggest you file a ticket in the PROJ.4 Trac on this issue with suggestions on how to proceed. Best regards, Frank On Thu, Dec 6, 2012 at 10:12 AM, Jeremy Palmer <[email protected]> wrote: > HI Frank, > > Thanks that's great news. Has this upgrade now started supporting data > shift grids, such as NZGD2000<->NZGD1949? > > Cheers > Jeremy > ________________________________________ > From: [email protected] [[email protected]] > On Behalf Of Frank Warmerdam [[email protected]] > Sent: Thursday, 6 December 2012 1:18 p.m. > To: PROJ.4 and general Projections Discussions; GeoTIFF; gdal-dev; > [email protected] > Subject: [gdal-dev] EPSG 8.0 Upgrade > > Folks, > > At the request of Howard Butler, I have upgraded PROJ.4, libgeotiff, and > GDAL to use the EPSG 8.0 database in development "trunk". > > This was accomplished, as usual based on the process described here: > > http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README > > Amoung other things this will result in some datums having new preferred > datum shift solutions. Upgrade with care. > > Best regards, > -- > > ---------------------------------------+-------------------------------------- > I set the clouds in motion - turn up | Frank Warmerdam, > [email protected] > light and sound - activate the windows | http://home.gdal.org/warmerda > and watch the world go round - Rush | Geospatial Software Developer > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > This message contains information, which is confidential and may be > subject to legal privilege. If you are not the intended recipient, you must > not peruse, use, disseminate, distribute or copy this message. If you have > received this message in error, please notify us immediately (Phone 0800 > 665 463 or [email protected]) and destroy the original message. LINZ > accepts no responsibility for changes to this email, or for any > attachments, after its transmission from LINZ. Thank You. > -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, [email protected] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer
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