>
>
>
> You can simplify your process because you already use -a_srs parameter
> ("assign spatial reference system") . Therefore it should not be necessary
> to create all those .prj files at all.
>
> Gdaladdo with resolution 1 does not make sense because it means creating
> an overview with original resolution. I hope that gdaladdo quitly skips
> it, otherwise you are getting all too large files.
>
Speaking from experience (I did this myself long ago before understanding)
- gdaladdo happily creates the pyramids at level 1. So you end up with a
file that's double it's original size!
> It is also good to know that gdaladdo -clean does not remove old overviews
> physically and filesize will not shrink.
>
Yup. It just removes the links to the overviews. I found that out the hard
way too. :-)
The lines in my last email have what seems to be the optimal - everything
is inside a single file and the result is optimised for GeoServer.
I've tested now it on the OS 50k for the entire country - there's no need
to split into two files and image mosaic. The resultant file is only about
2.5GB pre overviews (which usually add another 30%). So just loading that
file as a regular single GeoTiff should be fine.
Cheers,
Jonathan
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