Thanks Chaitanya. Unfortunately gdaladdo doesn't support the Lanczos
resampling type. Lanczos creates - by far - the best looking
downsampled images for my type of rasters. What I'm looking for is a
way to create pyramid layers/.ovr files using the Lanczos resampling method.
Robb
On 11/29/2011 12:58 AM, Chaitanya kumar CH wrote:
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]
<mailto:[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
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Best regards,
Chaitanya kumar CH.
+91-9494447584
17.2416N 80.1426E
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