[gdal-dev] garbled output from gdaladdo in geopackage

[Thomas Sevaldrud]

Ok, I've opened a ticket for it here:

http://trac.osgeo.org/gdal/ticket/6309

- Thomas

On Thu, Jan 14, 2016 at 12:27 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le jeudi 14 janvier 2016 12:07:44, Thomas Sevaldrud a écrit :
> > Hi,
> >
> > I've been using the new GeoPackage raster support in 2.0.1, and have
> > noticed some strange output from gdaladdo on certain datasets.
> >
> > When producing an overview tile which is on the edge of the dataset, so
> > that it is not entirely covered by its child tiles, I get random data in
> > the parts of the image which is outside the coverage.
>
> Part of tiles outside the coverage would be supposed to be at value 0 (and
> if
> using PNG tiles with alpha=0)
>
> >
> > I'm not sure how gdaladdo does this, but for standard x2 tile pyramids I
> > assume it makes each overview tile by subsampling its four child tiles.
> In
> > this case, not all four child tiles have data and the output in the
> missing
> > areas becomes garbled.
> >
> > Is this a known issue?
>
> Not that I'm aware of.
>
> > Any workarounds?
> >
> > If necessary, I can provide a test case to reproduce it.
>
> That might indeed be useful. Please file a ticket about that.
>
> Even
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>
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