[gdal-dev] .ovr files and Lanczos

Chaitanya kumar CH chaitanya.ch at gmail.com
Tue Nov 29 00:58:01 EST 2011


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
> ______________________________**_________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/**mailman/listinfo/gdal-dev<http://lists.osgeo.org/mailman/listinfo/gdal-dev>

Best regards,
Chaitanya kumar CH.

17.2416N 80.1426E
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20111129/4b7e1c3e/attachment.html

More information about the gdal-dev mailing list