On 11-10-29 02:00 PM, Komяpa wrote:
Hi,
2011/10/29 Frank Warmerdam<[email protected]>:
On 11-10-29 12:18 PM, Komяpa wrote:
Still, there are some things I would like to clear / discuss.
1) gdaladdo final.tif 2 4 8 16 32 64 128 256 makes not beautiful
overviews. If I add -r average, some artifacts start appearing, like
the vertical stripes on the link above. Any good ways to fix that?
Darafei
I would be interested in reproducing this at my end and investigating.
Could you provide something I can work with? I presume the issue
relates to the average overview builder not understanding nodata
masking. Are you using GDAL "trunk"?
You can grab geotiffs from http://dev.latlon.org/tiff/baloon/
Mapserver map file: http://dev.latlon.org/tiff/all.map
Hi,
I spent a bunch of time tracing through the average resampling kernel
and I think I have found an issue. However, it does not seem to be the
cause of the problem. It appears that your files start with the right
most column of pixels with the mask set when it shouldn't be ... for
instance in the file IMG_0990_modified.oam.tif.
I established this by running:
gdal_translate -b mask IMG_0990_modified.oam.tif mask.tif
and then carefully examining the right most column of mask.tif.
How was this generated? I think we need to go back to that step.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/warmerda
and watch the world go round - Rush | Geospatial Software Developer
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