[gdal-dev] .ovr files and Lanczos

[Chaitanya kumar CH]

Robb,

If you are using gdal version 1.6 or later, you can use the -ro option[1].
It opens the tiff file in read-only mode and creates external overview.

[1]: http://www.gdal.org/gdaladdo.html

On Mon, Nov 28, 2011 at 11:53 PM, Robb Wright <robbkwright at gmail.com> wrote:

>
> I'm working with indexed color types of raster data (charts).  The data is
> in RGB geotiffs and I'm using gdaladdo to create pyramid layers for them.
>  Unfortunately, the best method for this raster type available using
> gdaladdo is still pretty bad - much of the linework becomes garbled when
> viewing the pyramids.  The best-looking method that I've been able to come
> up with is:
> gdaladdo.exe --config COMPRESS_OVERVIEW DEFLATE -r average
>
> The Lanczos algorithm method works beautifully when used with other
> programs - but I need to create .ovr files.  gdal_retile.py output looks
> great - but I can't figure out how to create .ovr files from that output.
>
> Does anybody know of the availability of the Lanczos resampling method for
> gdaladdo - or of another way to create .ovr files with Lanczos?
>
> Robb
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>



-- 
Best regards,
Chaitanya kumar CH.

+91-9494447584
17.2416N 80.1426E
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