[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.
It opens the tiff file in read-only mode and creates external overview.
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?
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
Chaitanya kumar CH.
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