[Qgis-user] Re: Projection of Shapefile export

[Ken Norris]

As Micha suggested, the National AGD66 distortion grid at
http://www.icsm.gov.au/icsm/gda/gdatm/national66.zip
and AGD84 distortion grid at
http://www.icsm.gov.au/icsm/gda/gdatm/national84.zip
seem to be the way forward.

When unzipped, put into the proj directory (for me usr/share/proj) and
coupled via the +nadgrids= parameter in a Custom CRS, it seems to yield the
correct transform when tested.

+proj=utm +zone=55 +south +ellps=aust_SA +nadgrids=AGD66.gsb +units=m
+no_defs

(I renamed the unzipped distortion file 'A66 National (13.09.01).gsb' file
to 'AGD66.gsb' for convenience)

But I can't make the parameters stick in the CRS of a vector file using the
override facility. Any ideas?


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