[Qgis-developer] How does QGIS display vrts where the underlying imagery has overviews?

[Patrick Young]

Hi,

I have been really impressed with how QGIS can quickly display a vrt of
say, a bunch of tifs, when the underlying tifs have overviews already
created.  I was curious how it is going about accessing the overviews of
the underlying imagery, as the gdal api doesn't seem to think the vrt has
overviews or subdatasets, and QGIS itself doesn't mention the vrt having
overviews.

Can anyone illuminate this for me?

Thanks!
-Patrick
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20141120/b6a1890c/attachment.html>