Maybe this could help a little. I had a problem a while ago when I wanted to filter just the mask and then assemble it again. It took some reading to get it right. So I took the image apart with gdal_translate -b mask. Then ran gdal_sieve.py where I got a 8 bit mask. The tricky part was then the assembly. This is how I did the reassemble with two gdalbuildvrt:
### Convert the mask to a real 1 bit mask with the right mask flags ### and deflate compression echo "gdal_translate - real mask" gdal_translate -of GTiff -ot Byte -co NBITS=1 -co COMPRESS=DEFLATE -mo INTERNAL_MASK_FLAGS_1=2 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask_separate_clean.tif ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask.msk ### Combine the image with the mask gdalbuildvrt -b 1 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_1.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif gdalbuildvrt -b 2 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_2.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif gdalbuildvrt -b 3 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_3.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif echo "gdalbuildvrt" gdalbuildvrt -separate ${TIF_TMP_DIR}/${TIF_FILE_NAME}_combined.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_1.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_2.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_3.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask.msk echo "final gdal_translate" gdal_translate -b 1 -b 2 -b 3 -mask 4 -co COMPRESS=NONE -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co INTERLEAVE=BAND --config GDAL_TIFF_INTERNAL_MASK YES --config GDAL_CACHEMAX 512 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_combined.vrt ${DATA_OUTPUT_DIR}/${TIF_FILE_NAME}.tif Hope this helps you to take the image apart and then put back together again. /Lars S. 11 februari 2021 kl. 18:37, "Patrick Young" <patrick.mckendree.yo...@gmail.com (mailto:patrick.mckendree.yo...@gmail.com?to=%22Patrick%20Young%22%20<patrick.mckendree.yo...@gmail.com>)> skrev: Not sure what the expected behavior is with gdalwarp and the underlying mask preservation. It is kind of a tricky problem to solve in general; should the mask be resampled with the same kernel as used in the warp? Or should it always be NN? If the functionality is missing, this is a good opportunity to get your employer funding gdal development. A quick hack would be like you mention; you can extract the datamask (gdal_translate -b mask ... i think) and then warp that separately, and recombine. P On Thu, Feb 11, 2021 at 7:57 AM Daniele Romagnoli <daniele.romagn...@geo-solutions.it (mailto:daniele.romagn...@geo-solutions.it)> wrote: Hi Jukka, sorry but I can't share the data. Is owned by a customer :( Long story short: I have several raster tiles (with size around 5000x5000) and a shapefile containing edges defining valid area of each tile. I have used gdalrasterize to extract the needed crop for each tile to setup a binary mask. Then, I have combined the binary mask with the original tile and rewritten as a new TIFF file with internal masks. Then, I'm composing all the TIFF files to a VRT. When rewriting that VRT to a mosaic TIFF, everything looks good. I see the binary mask is used to properly compose/overlap/mask the pieces of the mosaic and the output contains the mask too. This is an example of gdalinfo on one of the mosaicked tiff: Driver: GTiff/GeoTIFF Files: out.tif Size is 45842, 42506 Coordinate System is: [... OMITTED... ] Metadata: AREA_OR_POINT=Area Image Structure Metadata: COMPRESSION=YCbCr JPEG INTERLEAVE=PIXEL JPEGTABLESMODE=1 JPEG_QUALITY=75 SOURCE_COLOR_SPACE=YCbCr Corner Coordinates: [... OMITTED... ] Band 1 Block=256x256 Type=Byte, ColorInterp=Red Mask Flags: PER_DATASET Band 2 Block=256x256 Type=Byte, ColorInterp=Green Mask Flags: PER_DATASET Band 3 Block=256x256 Type=Byte, ColorInterp=Blue Mask Flags: PER_DATASET So, as you can see the masks are added to the mosaicked dataset. However, when running gdalwarp -t_srs EPSG:NEWCODE out.tif warped.tif the binary mask is lost from the output file. I have also tried using -dstalpha but it complains that "Destination dataset has 3 bands, but at least 4 are needed" which makes sense. So I was just wondering if there is anything I should be aware of when warping a masked TIFF. I would probably try to transform the binary mask to an alpha band, do the warp and then convert back the alpha to a binary mask.... Thanks for any feedback in advance. Regards, Daniele On Thu, Feb 11, 2021 at 3:27 PM jratike80 <jukka.rahko...@maanmittauslaitos.fi (mailto:jukka.rahko...@maanmittauslaitos.fi)> wrote: Hi Daniele, Test data, please. -Jukka Rahkonen- Daniele Romagnoli-3 wrote > Thanks for the feedback, Patrick. > I have downloaded the latest build from GisInternals and it worked as > expected. > I have another question. > It looks like warping an input file containing a binary mask isn't > preserving the binary mask on the output. > Should I specify any flag for that? > > Thanks for the help. > Regards, > Daniele > _______________________________________________ > gdal-dev mailing list > gdal-dev@.osgeo > https://lists.osgeo.org/mailman/listinfo/gdal-dev > (https://lists.osgeo.org/mailman/listinfo/gdal-dev) -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html (http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html) _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org (mailto:gdal-dev@lists.osgeo.org) https://lists.osgeo.org/mailman/listinfo/gdal-dev (https://lists.osgeo.org/mailman/listinfo/gdal-dev) -- Regards, Daniele Romagnoli == GeoServer Professional Services from the experts! 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