[gdal-dev] GRIB SRS sensitive to CHECK_WITH_INVERT_PROJ

[Sean Gillies]

Hi Even,

On Tue, Jun 2, 2020 at 2:43 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> Hi Sean,
>
>
>
> > An empty string is printed to the terminal after the second warning. Note
>
> > that behavior was different with rasterio 1.1.4, which
>
> > set CHECK_WITH_INVERT_PROJ=YES internally in an attempt to improve the
>
> > defaults.
>
> >
>
> > The warning comes from
>
> >
> https://github.com/OSGeo/gdal/blob/2818ff0a49f65741a55b9cea79df496cc05f85e3/
>
> > gdal/frmts/grib/gribdataset.cpp#L2149 .
>
> >
>
> > Is this sensitivity expected?
>
>
>
> I'd say this isn't completely unexpected if the corners of the dataset are
> far from the projection center. There might be convergence issues in the
> inverse projection method (or it might not try to converge down to the
> precision we expect with CHECK_WITH_INVERT_PROJ=YES)
>
>
>
> CHECK_WITH_INVERT_PROJ is mostly a gdalwarp implementation detail to make
> things work in some cases. I wouldn't advise to use it universally unless
> you know you need to use it (one good reason is that not all PROJ
> projection methods have an inverse method, even if most popular ones do
> have one)
>
>
>
> Even
>

Got it. Thank you!

-- 
Sean Gillies
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