Jeremy, <div><br></div><div>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. </div>
<div><br></div><div>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?</div>
<div><br></div><div>I'd suggest you file a ticket in the PROJ.4 Trac on this issue with suggestions on how to proceed.</div><div><br></div><div>Best regards,</div><div>Frank</div><div><br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, Dec 6, 2012 at 10:12 AM, Jeremy Palmer <span dir="ltr"><<a href="mailto:JPalmer@linz.govt.nz" target="_blank">JPalmer@linz.govt.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
HI Frank,<br>
<br>
Thanks that's great news. Has this upgrade now started supporting data shift grids, such as NZGD2000<->NZGD1949?<br>
<br>
Cheers<br>
Jeremy<br>
________________________________________<br>
From: <a href="mailto:gdal-dev-bounces@lists.osgeo.org">gdal-dev-bounces@lists.osgeo.org</a> [<a href="mailto:gdal-dev-bounces@lists.osgeo.org">gdal-dev-bounces@lists.osgeo.org</a>] On Behalf Of Frank Warmerdam [<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a>]<br>
Sent: Thursday, 6 December 2012 1:18 p.m.<br>
To: PROJ.4 and general Projections Discussions; GeoTIFF; gdal-dev; <a href="mailto:metacrs@lists.osgeo.org">metacrs@lists.osgeo.org</a><br>
Subject: [gdal-dev] EPSG 8.0 Upgrade<br>
<div><div class="h5"><br>
Folks,<br>
<br>
At the request of Howard Butler, I have upgraded PROJ.4, libgeotiff, and<br>
GDAL to use the EPSG 8.0 database in development "trunk".<br>
<br>
This was accomplished, as usual based on the process described here:<br>
<br>
<a href="http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README" target="_blank">http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README</a><br>
<br>
Amoung other things this will result in some datums having new preferred<br>
datum shift solutions. Upgrade with care.<br>
<br>
Best regards,<br>
--<br>
---------------------------------------+--------------------------------------<br>
I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a><br>
light and sound - activate the windows | <a href="http://home.gdal.org/warmerda" target="_blank">http://home.gdal.org/warmerda</a><br>
and watch the world go round - Rush | Geospatial Software Developer<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>---------------------------------------+--------------------------------------<br>I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com" target="_blank">warmerdam@pobox.com</a><br>
light and sound - activate the windows | <a href="http://pobox.com/~warmerdam" target="_blank">http://pobox.com/~warmerdam</a><br>and watch the world go round - Rush | Geospatial Software Developer<br><br>
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