Jukka,
I think you could achieve what you want by adding a <Overview> element (see
http://www.gdal.org/gdal_vrttut.html ) inside the <VRTRasterBand> element. The
dataset pointed by the <SourceFilename> in <Overview> can be a .vrt.
So, schematically, you would have something like 100_percent.vrt :
<VRTDataset>
<VRTRasterBand>
<Overview>
<SourceFilename relativeToVRT="1">50_percent.vrt</SourceFilename>
<SourceBand>1</SourceBand>
</Overview>
</VRTRasterBand>
</VRTDataset>
and in 50_percent.vrt :
<VRTDataset>
<VRTRasterBand>
<Overview>
<SourceFilename relativeToVRT="1">25_percent.vrt</SourceFilename>
<SourceBand>1</SourceBand>
</Overview>
</VRTRasterBand>
</VRTDataset>
and so on
>
> -Jukka Rahkonen-
>
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