Embedding external overview into GeoTIFF

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Embedding external overview into GeoTIFF

Tom Wardrop-2
Hi,

Does anyone know if it's possible to embed an external overview as an internal overview? Due to  a long-standing performance-related bug (https://github.com/OSGeo/gdal/issues/1442), generating internal overviews on larger GeoTIFF's takes many weeks. Generating them as external overviews on the other hand takes a day for the same GeoTIFF's. 

Any push in the right direction is much appreciated.

Cheers,
Tom

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