[gdal-dev] Downsample with averaging?

[Jay Jennings]

Brilliant ! That works well, and fast.  For the record, a command like:

gdal_translate -outsize 3.125% 3.125% XXXX.tif XXXX_dzm32.tif

serves to extract the 32:1 reduced-resolution level from a file created with a command like:

gdaladdo -r cubic XXXX.tif 2 4 8 16 32 64 128 256

and the result is a nicely smoothed dezoom of the original.

-----Original Message-----
From: gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Jean-Claude Repetto
Sent: Tuesday, February 22, 2011 10:48 AM
To: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Downsample with averaging?

Le 22/02/2011 16:39, Jay Jennings a écrit :
>  >> there is a gdal method to extract a single overview level from a tif
> but I can never
>
>  >> remember it maybe someone will chime in...
>
> If so, that would be really helpful. Does anyone know how to extract a
> single overview from a pyramid'd image such as made from a command like:
>
> gdaladdo XXXX.tif 2 4 8 16 32 64 128 256
>

gdal_translate with the -outsize parameter should do the job.

Jean-Claude
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