[PROJ] OGRCreateCoordinateTransformation()

[Even Rouault]

Le 28/03/2022 à 23:02, Steve Riddell a écrit :
>
> Hi Even,
>
> It’s working now, for my two test cases, --- as long as there’s a 
> TOWGS84[0, 0, 0, 0, 0, 0, 0] field in the WKT w/ the geoid grid. I’m 
> guessing that ties the grid to the datum/geogcs of the containing 
> compound CRS?
>
yes. That works also for me if there's no TOWGS84[], but then PROJ will 
issue a more complicated pipeline doing a non-null horizontal datum 
shift from NAD83(CSRS) to WGS 84, since (without PR3216/3217), it 
assumes that the vertical grid is referenced to WGS 84.
>
> Thanks!
> Steve
>
> *From:* Even Rouault <even.rouault at spatialys.com>
> *Sent:* Monday, March 28, 2022 3:15 PM
> *To:* Steve Riddell <sriddell at geocue.com>; proj <proj at lists.osgeo.org>
> *Cc:* Suresh Jakka <sjakka at geocue.com>
> *Subject:* Re: OGRCreateCoordinateTransformation()
>
> Steve,
>
>     Sorry for the delay, but I’ve now tested with PR3216, alone, and
>     then with PR3127.  I’m getting the same behavior as I reported
>     below.   Perhaps my best chance at getting this to work is to
>     either directly make proj calls, or construct the pipeline myself
>     and pass through gdal?
>
> That was indeed an entirely different issue. Fix queued in 
> https://github.com/OSGeo/PROJ/pull/3147
>
> Even
>
> -- 
>
> http://www.spatialys.com
> My software is free, but my time generally not.

-- 
http://www.spatialys.com
My software is free, but my time generally not.
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