Good afternoon listers-
I've just encountered an odd problem. I'm trying to convert UTM coords
between NAD27 and WGS84 datums for 150K points in Canada. I did an easy
CentroidX&Y(obj) command with the map window in the WGS84 projection I
wanted and updated new columns with the values, which appeared to work. The
problem came when I verified the result using Geographic Calculator - the
values were off by quite a few meters (up to 50). Is this an acceptable
error when dealing with transformations or are the two using different
projection parameters? I know they both use the Molodensky method of
transformation (which has it's own degree of
(in)accuracy), but I'm not sure if they are both using the same NAD27 - is
it Canada Mean or Canada MRE?
Another loaded question - does anyone know off hand what the dX,dY and dZ
parameters MI uses for the conversion?
Jason Adam
Computer Draftsperson
Monopros Limited
One William Morgan Drive
Toronto, ON M4H 1N6
Tel: 416.423.5811
Fax: 416.423.9944
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