[Gdal-dev] gdal/ogr/proj and NAD83(CSRS)

[Matt Wilkie]

> I suspect EPSG does not define a NAD83(CSRS) datum 
> because it needs a dynamic reference frame definition, 
> which cannot be approximated decently with a seven parameters 
> transformation, anyway. So it would be not a proper approach.

For clarity, EPSG does define a NAD83(CSRS) datum, it's proj that isn't. As
for the second part of your comment: does this mean GDAL et al. only does 3
and 7 parameter transformations? and not any of the ITRF stuff? 

> ftp://geod.nrcan.gc.ca/pub/GSD/craymer/pubs/nad83_hydroscan2006.pdf
> ftp://geod.nrcan.gc.ca/pub/GSD/craymer/pubs/nad83_geomatica2006.pdf

Thanks for those Francesco. It is clear I have yet more studying to do!

-matt

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