[PROJ] PROJ and nadgrids vs hgridshift +grids

[Even Rouault]

+proj=hgridshift can also work on NTv2 .gsb files. Cf 
https://proj.org/operations/transformations/hgridshift.html#cmdoption-arg-grids

Le 31/08/2022 à 15:41, David Fileccia a écrit :
>
> I need to get the grid shift of the NtV2 files for the Australian 
> National Grid 1984. I can use the .TIF files in the PROJ data but I 
> also need to be able to use the original GSB file for customers that 
> only understand the official government data.
>
> My current setup for the .TIF file is:
>
> conststd::string p="+proj=pipeline"
>
> "+step+proj=unitconvert+xy_in=deg+xy_out=rad"
>
> "+step+proj=hgridshift+grids=<gridpath>.tif+inv"
>
> "+step+proj=unitconvert+xy_in=rad+xy_out=deg";
>
> I tried:
>
> conststd::string p="+proj=pipeline"
>
> "+step+proj=unitconvert+xy_in=deg+xy_out=rad"
>
> "+step+nadgrids=<gridpath>.gsb+inv"
>
> "+step+proj=unitconvert+xy_in=rad+xy_out=deg";
>
> Of course, this failed saying it is an invalid pipeline.
>
> What is the correct pipeline for this procedure?
>
> Best Regards,
>
> *David Fileccia*
>
> *Senior Systems Engineer | HEMISPHERE GNSS*
>
> Office: 6860 Little Twin Road, Germantown, OH 45327, USA
>
> Corporate: 8515 E. Anderson Drive, Scottsdale, AZ 85255, USA
>
> *M:* +1 404 579 4391
>
> dfileccia at hgnss.com <mailto:dfileccia at hgnss.com> | www.hgnss.com 
> <http://www.hgnss.com/>
>
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