On Tue, 2 Mar 2010, Casey Vandenberg wrote:

Thanks Paul,

That was a typo on my part when specifying the ellipsoid. By typing in clrk66, it does maintain the correct ellipsoid and datum transform parameters. It is unnerving though how when I specify the Nad27 datum with an associated datum transformation shift, it will reject it and use only the nad27 default transformation parameters.

I agree - it could arguably be considered a bug. I've submitted a patch to GDAL for consideration, which would fix this - see http://trac.osgeo.org/gdal/ticket/3450

Paul
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