Selon Jukka Rahkonen <[email protected]>: > Even Rouault <even.rouault <at> mines-paris.org> writes: > > > > - cheat a bit and create a white image that you add as the first position > in > > your VRT. > > > > This can be a single pixel image that you artifically expand to full VRT > size, > > like this : > > > > <SrcRect xOff="0" yOff="0" xSize="1" ySize="1"/> > > <DstRect xOff="0" yOff="0" xSize="replace_by_vrt_x_size" > > ySize="replace_by_vrt_y_size"/> > > > This was the ultimate guru solution - simple, extremely fast and totally > undocumented. > > I made an one pixel sized image "onepixel.tif" as you suggested and placed > the > following SimpleSource as the first source for each band > > <SimpleSource> > <SourceFilename relativeToVRT="1">onepixel.tif</SourceFilename> > <SourceBand>1</SourceBand> > <SrcRect xOff="0" yOff="0" xSize="1" ySize="1" /> > <DstRect xOff="0" yOff="0" xSize="2000" ySize="2000" /> > </SimpleSource> > > Knowing tricks is fun but I could tolerate having some parameter driven way > for > setting the VRT background colour.
Actually, I'm just thinking that there's another less convoluted way of doing it. Try using "-vrtnodata 255 -hidenodata" as options of gdalbuildvrt. (This was added in https://trac.osgeo.org/gdal/ticket/3327 ) > > -Jukka Rahkonen- > > > _______________________________________________ > 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
