[gdal-dev] gdalwarp together with proj5 pipelines

[Markus Metz]

On Tue, Sep 18, 2018 at 4:25 PM Dalia Prizginiene <dalia at lmi.is> wrote:
>
> Hello,
>
> Thank you for your reply, but that to be sure: does it mean that gdalwarp
at the moment does not allow also horizontal grid shift like
"+proj=hgridshift +grids=ISN93_16.gsb" or "+proj=latlong
 +nadgrid=xxxx.gsb" ?

the GDAL developers will be able to answer your question. As Even wrote,

"For now, you have to use -s_srs / -t_srs with projections method supported
by PROJ"

the above definitions could work as part of a -s_srs / -t_srs definition.

I was to referring to "+proj=pipeline ..." which is supported in GRASS GIS
7.6 if compiled with PROJ 5.x

Best regards,

Markus M

>
>
>
> Best regards
>
> Dalia
>
>
> ________________________________
> From: Markus Metz <markus.metz.giswork at gmail.com>
> Sent: Thursday, September 13, 2018 8:15:41 PM
> To: Dalia Prizginiene
> Cc: gdal-dev
> Subject: Re: [gdal-dev] gdalwarp together with proj5 pipelines
>
>
>
> On Thu, Sep 13, 2018 at 4:52 PM Dalia Prizginiene <dalia at lmi.is> wrote:
> >
> > Hello,
> >
> > Is it possible to use gdalwarp together with pipelines "+proj=pipeline
+step  +inv  +proj=lcc  +lat_1=64...
> >
> > to transform the raster into different datum?
> >
> >
> > In here
http://osgeo-org.1560.x6.nabble.com/gdal-dev-proj-5-support-added-in-trunk-td5358899.html
it is said that "-ct" it could be used. But at the moment this option does
not work.
> >
> >
> > Maybe there is another option how to use gdalwarp together with
pipelines of proj5?
>
> Custom proj5-style pipelines are supported in GRASS 7.6, not yet
released. GRASS uses GDAL + PROJ for reprojection, and any testing on this
new feature would help those projects.
>
> In GRASS 7.6, you can define custom proj5-pipelines with r.proj
pipeline=...
>
> Markus M
>
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