[postgis-users] st_createoverview

Sandro Santilli strk at keybit.net
Wed Apr 13 11:24:52 PDT 2016

On Wed, Apr 13, 2016 at 09:57:10AM +0200, Horst Düster wrote:
> Hi
> It played with st_createoverview based on a tiled PostGIS raster table
> (raster.jpg). The overviews are created fine, but when I open the raster
> layer with QGIS I get a black grid in the overview raster layer
> (overview.jpg). Is it a bug?
> I'll appreciate any hint.

It could be a bug. A few things to check:

Is the input already tiled ?
Would it work if you made the input untiled ?
Are all input tiles of the same size ?
Are the input tiles sizes multiple of the given reduction factor ?


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