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

[Matt Wilkie]

Let's see if I have this straight then: if I specify -t_srs epsg:4617 and not
+nadgrid, no datum transformation occurs, even though the output .prj file
says it has?

-matt


Francesco P. Lovergine wrote:
> 
> On Fri, Jul 24, 2009 at 09:09:27AM -0700, Matt Wilkie wrote:
>> 
>> Now back to GDAL and related projects: does the fact that there is no
>> proj4
>> NAD83(CSRS) datum parameter mean the X-to-NAD83(CSRS) transformation is
>> not
>> happening? 
> 
> AFAIK for Canada you can download the freely available NTv2 file from the 
> CSRS database and use it with the +nadgrid parameter, if your
> application requires high precision fitting. 
> 


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