[gdal-dev] garbled output from gdaladdo in geopackage

[Thomas Sevaldrud]

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.

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? Any workarounds?

If necessary, I can provide a test case to reproduce it.

Thomas
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