[gdal-dev] Rasterlite and external overviews

[Even Rouault]

> While trying external overviews I found two troubles. First one is that
> it isimpossible to build external overviews if there has been internal
> overviews in the table. Removing them with "gdaladdo -clean" does not
> help, the message is still:
> ERROR 6: Cannot add external overviews to a dataset with internal overviews
> Overview building failed.

I don't reproduce that. Did you check with gdalinfo that the internal overview 
was properly cleaned ?

> Another problem is not big. Gdaladdo just gives a faulty error message
> first but it still creates external overviews. This is what gets printed
> on the screen:
> 
> gdaladdo -ro RASTERLITE:addotest3.sqlite,table=t8000 2 4 8
> ERROR 4: `addotest3.sqlite_t8000' does not exist in the file system,
> and is not recognised as a supported dataset name.

ok, I've just fixed that.

> 
> 0...10...20...30...40...50...60...70...80...90...100 - done.
> 
> It would be really good to have at least average method also for
> internal overviews.

Thinking about it again, this might be doable with modest code addition in the 
driver. Please file a ticket about that.

> 
> -Jukka Rahkonen-
> 
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