Hi Even, I am getting closer ! I added the -addalpha to the VRT image. gdalbuildvrt -addalpha MyImage.vrt MyImageEast.tif MyImageWest.tif
1) The final GPKG is much better with the *default* parameters : gdal_translate -of GPKG MyImage.vrt MyImage.gpkg The output GPKG image only contains the relevant pixel information. 2) If I want to use a standard scheme (e.g. InspireCRS84Quad), gdal_translate still creates the transparent tiles: gdal_translate -of GPKG -co TILING_SCHEME=InspireCRS84Quad -co ZOOM_LEVEL_STRATEGY=AUTO MyImage.vrt MyImage.gpkg I turned the debug mode on. There are calls to GDALWarpKernel(). If I understand the GPKG format description <https://gdal.org/drivers/raster/gpkg.html> well, this is due to the fact that my East and West TIFF images are not exactly aligned with the InspireCRS84Quad grid. Furthermore, I don't understand the line : WARP: SetAlphaMax: AlphaMax not set Is there anything to add to the gdal_translate command, so that the "transparent information" is not ignored? Here is a debug dump: GDAL: GDALOpen(MyImage.vrt, this=00000000004E2730) succeeds as VRT. Input file size is 6409301, 1277 GDAL: QuietDelete(UANTIM.vrt.gpkg) invoking Delete() GDAL: GDALDefaultOverviews::OverviewScan() GDAL: Computing area of interest: -180, 47.9316, 180, 48.0033 OGRCT: Wrap source at 2.69241e-05. OGRCT: Wrap target at 2.69241e-05. OGRCT: Wrap source at 2.69241e-05. OGRCT: Wrap target at 2.69241e-05. GDAL: Computing area of interest: -180, 47.9316, 180, 48.0033 OGRCT: Wrap source at 2.69241e-05. OGRCT: Wrap target at 2.69241e-05. WARP: SetAlphaMax: AlphaMax not set. WARP: SetAlphaMax: AlphaMax not set. GDAL: GDAL_CACHEMAX = 403 MB GDAL: GDALOpen(UANTIM_wgs84NEGATIF_ouest.tif, this=000000000316DBF0) succeeds as GTiff. GDAL: GDALWarpKernel()::GWKBilinearNoMasksOrDstDensityOnlyByte() Src=0,0,1371x1277 Dst=0,0,1792x1671 0GDAL: GDALWarpKernel()::GWKRealCase() Src=1368,0,1567x1277 Dst=1792,0,2048x1671 GDAL: GDALWarpKernel()::GWKRealCase() Src=2932,0,1568x1277 Dst=3840,0,2048x1671 -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
