How do I get overviews to work with VRT datasets ? What I do is - creating a .vrt with additional alpha band + nodata using gdalbuildvrt (wrapping an existing TIFF) - creating overviews using gdaladdo. I then get an external .ovr file. - creating a new TIFF from the VRT
First, it seems that the .vrt does not get updated, as there is no <Overview> tags. I then tried to manually add <Overview> for each band, but the output TIFF does not have overviews in it.. just the original bitmap and a mask for it. Example: gdalbuildvrt _r-32-2-4776-64728.vrt -overwrite -addalpha -srcnodata 0 -vrtnodata 0 r-32-2-4776-64728.tif gdaladdo _r-32-2-4776-64728.vrt 2 4 8 16 32 64 gdal_translate -of GTiff -co COMPRESS=JPEG -co JPEG_QUALITY=80 -co PHOTOMETRIC=YCBCR -b 1 -b 2 -b 3 -mask 4 -co COPY_SRC_OVERVIEWS=YES --config GDAL_TIFF_INTERNAL_MASK YES _r-32-2-4776-64728.vrt output\r-32-2-4776-64728.tif Also, I tried to add overviews embedded inside the source tiff (wrapped in the same .vrt), but still no overviews in the output. Note, that what I'm really trying to do, is to create TIFF with JPEG compression, and adding a mask that is not "contaminated" with jpeg artifacts. What am I doing wrong ? :) -- oyvind
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