[OSRS-PROJ] NTv2 (.gsb) grid shifting support

Frank Warmerdam warmerdam at pobox.com
Sat Mar 15 01:06:03 EST 2003


I have preliminary support for Canadian NTv2 grid shift files incorporated
into PROJ.4 with some major flaws still (it does not pick the most refined
grid).  This is the same .gsb format used by some other organizations,
notably in Australia.

I write this to warn people that the structural changes in PROJ.4 (in the
datum shifting area) were substantial and are not really quite complete
so take care using PROJ.4 from CVS for a week or so.

Best regards,

I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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