Jukka,
I think you could achieve what you want by adding a element (see
http://www.gdal.org/gdal_vrttut.html ) inside the element. The
dataset pointed by the in can be a .vrt.
So, schematically, you would have something like 100_percent.vrt :
50_percent.vrt
Hi,
I am not sure if it is already possible to do what I want with .VRT file but I
just do not know how. Therefore I prepared a test set if someone happens to be
interested in having a look.
Zip file is at http://latuviitta.org/documents/scale_dependent_gdal_meta_vrt.zip
The package contains:
-