[gdal-dev] VRT, how should I create overviews on the mask

[Guy Doulberg]

Hi guys

I am using a VRT in front of many geotif rasters, the size of the vrt could
be in thousands

I am using gdaladdo on that vrt to per-calculate overviews, and I get an
ovr file.

In the orginal vrt file I have also definition of a mask, basically each of
the origin files has mask, so I am using the mask from the original geotiff
files

gdalinfo on the vrt:

Band 1 Block=128x128 Type=UInt16, ColorInterp=Gray
  Overviews: 4096x6144, 2048x3072, 1024x1536, 512x768, 256x384, 128x192
  Mask Flags: PER_DATASET


gdalinfo of the ovr file:

Band 1 Block=128x128 Type=UInt16, ColorInterp=Gray
  Overviews: 2048x3072, 1024x1536, 512x768, 256x384, 128x192


So it seems like there are no overviews on top of the mask, and when trying
to fetch the mask I can see that each of the original tifs is being
accessed,
this is not the case if I don't read the mask

So my question is, is there a way to create overviews with mask and when
accessing a vrt that has overviews on mask to use the overviews on mask?

Thanks, Guy
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