See http://trac.osgeo.org/gdal/ticket/4484
On Tue, Jan 29, 2013 at 6:19 AM, Even Rouault <[email protected]> wrote: > Selon Terry Rankine <[email protected]>: > >> Hi Guys >> >> I have an ERS (ermapper) dataset I want to reproject into wsg84 and then >> change the file format to netcdf4. I am using GDAL 1.9.2 linked against >> netcdf 4.1.3 >> >> I get different results using the following. >> >> One step: >> * gdalwarp /projects/r17/GA/GSQ_P1247tmig.ers -s_srs "+proj=latlong >> +datum=GDA94" -t_srs "+proj=latlong +datum=WGS84" -r cubic -of NETCDF >> -overwrite -co "FORMAT=NC4" -co "COMPRESS=DEFLATE" -co "ZLEVEL=9" -dstnodata >> -99999 onestep.nc4 >> >> Two step >> * gdalwarp -of ERS -s_srs "+proj=latlong +datum=GDA94" -t_srs "+proj=latlong >> +datum=WGS84" -r cubic /projects/r17/GA/GSQ_P1247tmig.ers reproj.ers >> -dstnodata -99999 >> * gdal_translate -of netCDF -co "FORMAT=NC4" -co "COMPRESS=DEFLATE" -co >> "ZLEVEL=9" -stats reproj.ers reproj.nc4 >> >> In fact - the onestep destroys part of my data. >> OneStep output >> <http://osgeo-org.1560.n6.nabble.com/file/n5030451/onestep.nc4> >> >> two step output: >> <http://osgeo-org.1560.n6.nabble.com/file/n5030451/reproj.nc4> >> >> Can someone let me know what I am doing wrong? > > Nothing. The netCDF driver would need enhancements to fully support random > writing. I believe there are already tickets in Trac about that, or there was > a > related discussion on that topic some time ago. The 2 step method is the > recommanded one for the time being. > > For the one step process, you could perhaps try adding -wo OPTIMIZE_SIZE=TRUE > (see > http://gdal.org/structGDALWarpOptions.html#a0ed77f9917bb96c7a9aabd73d4d06e08 > ). > This will perhaps work, but at the expense of a slow warping in some > situations. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > 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
