[gdal-dev] VRT file from NetCDF

[Etienne Tourigny]

Can you not pass the full path to the vrt file? This would resolve the
problem.  Like Even I don't see an easy fix in the driver.

Etienne

On Wed, Feb 29, 2012 at 6:57 AM, Yves Jacolin <yjacolin at free.fr> wrote:
> Even,
>
> I understand.
>
> Thanks,
>
> Y.
> Le Mercredi 29 Février 2012 09:54:27 Even Rouault a écrit :
>> Selon Yves Jacolin <yjacolin at free.fr>:
>> > Hello,
>> >
>> > Sorry to come again to this thread :)
>> >
>> > It seems that when using relatif file for NETCDF for instance, MapServer
>> > won't
>> > work correclty, see Even comment below.
>> >
>> > Is it a bug from GDAL? Do I need to open a ticket about this?
>>
>> I don't see an easy fix to improve that. That would require some cooperation
>> with the driver to return the filename from the connection string and to
>> reform a new connection string with the full filename. IMHO not worth the
>> effort, but perhaps worth documenting it for the moment.
>>
>> > Y.
>> >
>> > >Selon Yves Jacolin <yjacolin at free.fr>:
>> > >> Hello,
>> > >>
>> > >> Etienne asked some question offlist so I investigate.
>> > >>
>> > >> gdal create relatif path by default (I don't see a flag to change
>> > >> this). MapServer and QGIS don't like this.
>> > >
>> > >MapServer and QGIS don't even know the content of the VRT, so the
>> > >problem is more complex than that.
>> > >
>> > >If you pass a relative path to gdalbuildvrt or gdal_translate -of VRT,
>> > >a
>> > >relative path will be written. In which case the VRT driver should be
>> > >able>
>> > to
>> >
>> > >recompute the full path given the location of the .vrt.
>> > >On the contrary, if you pass an absolute path, it will be store as
>> > >absolute.
>> > >
>> > >The issue here is likely with netCDF subdatasets, where the connexion
>> > >string is
>> > >not a file, but something like "netCDF:xxxx:a_filename", that the VRT
>> > >driver cannot interpret. In that case, the resolution of relative
>> > >filenames will>
>> > not
>> >
>> > >work. So I'd suggest you to use "netCDF:xxx:full_filename" to avoid
>> > >those issues. Or you must be sure that the current directory of
>> > >MapServer and QGIS is
>> > >the directory of the .VRT, but you cannot always guarantee this.
>> > >
>> > >> After changing relatif path to absolute path both are working
>> > >> correctly.
>> > >>
>> > >> Thanks,
>> >
>> > Y.
>> > --
>> > Yves Jacolin
>> >
>> > http://yjacolin.gloobe.org
>> > _______________________________________________
>> > gdal-dev mailing list
>> > gdal-dev at lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/gdal-dev
> --
> Yves Jacolin
>
> http://yjacolin.gloobe.org
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