Hello,

currently I am building overviews with gdal_retile for a bunch of tiled rasters 
- the overviews are stored in geotiff for each level  in a separate folder 1, 
2, 3, 4.

I am quite happy with the performance of the format on geoserver, but I think 
there is a problem with updates. Usually just some rasters get an update - the 
rest remains the same. So I want to recalculate only some rasters and all the 
overviews of those.

I couldn't find a way to recalculate only a part of a the gdal_retile output - 
it's always adding new geotiffs instead of overwriting the existing ones.  I 
thought maybe gdalddo is an alternative to gdal_retile for the updates, but as 
far as I see it's not possible to create a pyramid with external tif files (not 
ovr).

So, my question is: Is there a possibility to recalculate a part of a pyramid 
created with gdal_retile?

Thanks!
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