<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><div data-html-editor-font-wrapper="true" style="font-family: arial, sans-serif; font-size: 13px;">Maybe this could help a little.<br><br>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.<br>So I took the image apart with gdal_translate -b mask. Then ran gdal_sieve.py where I got a 8 bit mask.<br>The tricky part was then the assembly. This is how I did the reassemble with two gdalbuildvrt:<br><br>### Convert the mask to a real 1 bit mask with the right mask flags<br>### and deflate compression<br><br>echo "gdal_translate - real mask"<br><br>gdal_translate \<br> -of GTiff \<br> -ot Byte \<br> -co NBITS=1 \<br> -co COMPRESS=DEFLATE \<br> -mo INTERNAL_MASK_FLAGS_1=2 \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask_separate_clean.tif \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask.msk<br><br>### Combine the image with the mask<br><br>gdalbuildvrt -b 1 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_1.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif<br>gdalbuildvrt -b 2 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_2.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif<br>gdalbuildvrt -b 3 ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_3.vrt ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp.tif<br><br>echo "gdalbuildvrt"<br><br>gdalbuildvrt \<br> -separate ${TIF_TMP_DIR}/${TIF_FILE_NAME}_combined.vrt \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_1.vrt \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_2.vrt \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_warp_3.vrt \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_mask.msk<br><br>echo "final gdal_translate"<br><br>gdal_translate \<br> -b 1 -b 2 -b 3 -mask 4 \<br> -co COMPRESS=NONE \<br> -co TILED=YES \<br> -co BLOCKXSIZE=512 \<br> -co BLOCKYSIZE=512 \<br> -co INTERLEAVE=BAND \<br> --config GDAL_TIFF_INTERNAL_MASK YES \<br> --config GDAL_CACHEMAX 512 \<br> ${TIF_TMP_DIR}/${TIF_FILE_NAME}_combined.vrt \<br> ${DATA_OUTPUT_DIR}/${TIF_FILE_NAME}.tif<br><br>Hope this helps you to take the image apart and then put back together again.<br><br>/Lars S.<br><br><br>11 februari 2021 kl. 18:37, "Patrick Young" <<a target="_blank" tabindex="-1" href="mailto:patrick.mckendree.young@gmail.com?to=%22Patrick%20Young%22%20<patrick.mckendree.young@gmail.com>">patrick.mckendree.young@gmail.com</a>> skrev:<br> <blockquote><div><div> <div dir="ltr">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.<div></div> <div>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.</div> <div></div> <div>P<div></div> <div></div> </div> </div> <div> <div dir="ltr">On Thu, Feb 11, 2021 at 7:57 AM Daniele Romagnoli <<a rel="external nofollow noopener noreferrer" target="_blank" tabindex="-1" href="mailto:daniele.romagnoli@geo-solutions.it">daniele.romagnoli@geo-solutions.it</a>> wrote:</div> <blockquote style="margin: 0px 0px 0px 0.8ex;border-left: 1px solid rgb(204,204,204);padding-left: 1ex"> <div dir="ltr">Hi Jukka,<div>sorry but I can't share the data. Is owned by a customer :(</div> <div></div> <div>Long story short:</div> <div>I have several raster tiles (with size around 5000x5000) and a shapefile containing edges defining valid area of each tile.</div> <div></div> <div>I have used gdalrasterize to extract the needed crop for each tile to setup a binary mask.</div> <div>Then, I have combined the binary mask with the original tile and rewritten as a new TIFF file with internal masks.</div> <div>Then, I'm composing all the TIFF files to a VRT.</div> <div>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:</div> <div></div> <div>Driver: GTiff/GeoTIFF<br>Files: out.tif<br>Size is 45842, 42506<br>Coordinate System is:<br>[... OMITTED... ]<br><br>Metadata:<br>AREA_OR_POINT=Area<br>Image Structure Metadata:<br>COMPRESSION=YCbCr JPEG<br>INTERLEAVE=PIXEL<br>JPEGTABLESMODE=1<br>JPEG_QUALITY=75<br>SOURCE_COLOR_SPACE=YCbCr<br>Corner Coordinates:<br>[... OMITTED... ]<br>Band 1 Block=256x256 Type=Byte, ColorInterp=Red<br>Mask Flags: PER_DATASET<br>Band 2 Block=256x256 Type=Byte, ColorInterp=Green<br>Mask Flags: PER_DATASET<br>Band 3 Block=256x256 Type=Byte, ColorInterp=Blue<br>Mask Flags: PER_DATASET</div> <div></div> <div>So, as you can see the masks are added to the mosaicked dataset.</div> <div></div> <div>However, when running</div> <div>gdalwarp -t_srs EPSG:NEWCODE out.tif warped.tif</div> <div></div> <div>the binary mask is lost from the output file.</div> <div>I have also tried using -dstalpha but it complains that "Destination dataset has 3 bands, but at least 4 are needed" which makes sense.</div> <div></div> <div>So I was just wondering if there is anything I should be aware of when warping a masked TIFF.</div> <div>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....</div> <div></div> <div>Thanks for any feedback in advance.</div> <div>Regards,</div> <div>Daniele</div> <div></div> <div></div> <div></div> <div></div> </div> <div> <div dir="ltr">On Thu, Feb 11, 2021 at 3:27 PM jratike80 <<a target="_blank" rel="external nofollow noopener noreferrer" tabindex="-1" href="mailto:jukka.rahkonen@maanmittauslaitos.fi">jukka.rahkonen@maanmittauslaitos.fi</a>> wrote:</div> <blockquote style="margin: 0px 0px 0px 0.8ex;border-left: 1px solid rgb(204,204,204);padding-left: 1ex">Hi Daniele,<br><br>Test data, please.<br><br>-Jukka Rahkonen-<br><br><br><br>Daniele Romagnoli-3 wrote<br>> Thanks for the feedback, Patrick.<br>> I have downloaded the latest build from GisInternals and it worked as<br>> expected.<br>> I have another question.<br>> It looks like warping an input file containing a binary mask isn't<br>> preserving the binary mask on the output.<br>> Should I specify any flag for that?<br>><br>> Thanks for the help.<br>> Regards,<br>> Daniele<br>> _______________________________________________<br>> gdal-dev mailing list<br><br>> gdal-dev@.osgeo<br><br>> <a rel="external nofollow noopener noreferrer" target="_blank" tabindex="-1" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br><br><br><br><br><br>--<br>Sent from: <a rel="external nofollow noopener noreferrer" target="_blank" tabindex="-1" href="http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html">http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html</a><br>_______________________________________________<br>gdal-dev mailing list<br><a target="_blank" rel="external nofollow noopener noreferrer" tabindex="-1" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br><a rel="external nofollow noopener noreferrer" target="_blank" tabindex="-1" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a> </blockquote> </div> <div></div>--<div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"> <div dir="ltr">Regards,</div> <div dir="ltr">Daniele Romagnoli</div> <div dir="ltr">==</div> <div dir="ltr">GeoServer Professional Services from the experts! 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