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 <[email protected]> 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 > [email protected] > http://lists.osgeo.org/**mailman/listinfo/gdal-dev<http://lists.osgeo.org/mailman/listinfo/gdal-dev> > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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