[gdal-dev] Downscaled geotiff with overviews

[Peter Schmitt]

On Fri, Jul 30, 2021 at 12:28 PM Javier Jimenez Shaw <j1 at jimenezshaw.com>
wrote:

> I want to make a (power-of-two) downscaled version of a geotiff with
> overviews efficiently with C++ (not from the console).
>

I know you said you want to do this from C++ and not the console. In case
you did want to do it from the console... there's an open option for
gdal_translate to pluck a particular overview level out, like so:

gdal_translate in.tif out.tif -oo OVERVIEW_LEVEL=1

You might be able to do this with cleverly named overviews, like so:

gdal_translate in.tif out.tif.ovr -oo OVERVIEW_LEVEL=2

gdal_translate in.tif out.tif.ovr.ovr -oo OVERVIEW_LEVEL=3

...


and then one final translate which uses all the overviews to a new final
TIF.

Cheers,
Pete
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