Yves, processing of netcdf files like this may be much easier using NCO (http://nco.sourceforge.net/)
example: ncap -s "WND=sqrt(u^2+v^2)" in.nc out.nc Etienne On Wed, Dec 21, 2011 at 5:32 PM, Yves Jacolin (free) <[email protected]> wrote: > Le mercredi 21 décembre 2011 21:01:22, Frank Warmerdam a écrit : >> On Wed, Dec 21, 2011 at 11:41 AM, Yves Jacolin (free) <[email protected]> > wrote: >> > Hello, >> > >> > I have some question about writing pixel functions with vrt files. I have >> > a netcdf file with two subset named U and V. >> > >> > How can I process sqrt(U^2 + V^2) using this feature with vrt file? >> > >> > * do I need to create a C file and build GDAL with it? >> >> Yves, >> >> Yes - registered in a particular way. I must confess to me >> this makes custom pixel functions of modest value. >> >> > * do I need to create a C file and locate it close to vrt file? > Thanks Franck. This seems indeed a little bit harder to use it but this exists > at least! > > Is it possible to improve this feature by linking a file dynamicly? I don't > know anything about this so it is just for my curiosity. > > Thanks, > > Y. > -- > Yves Jacolin > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
