Hi all, It's been my understanding that GDAL's RasterIO (most current version) uses overviews when available, implicitly. Is this also true for VRTs and warped VRTs or is not true?
I ask because 1) in reading from a warped VRT (using vsicurl) I'm not seeing use of the overviews in the GeoTIFF source that surface in the VRT, and 2) in reading the source of gdalwarp_lib.cpp I see that it has its own code for navigating overview levels and does not rely on any implicit overviews. Thanks in advance, -- Sean Gillies
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