Martin, Could you file a ticket with the details on how to reproduce this? It should not normally be necessary to set SOURCE_EXTRA and even when it is needed I would expect the difference to be with regard to whether there are holes/cracks in the imagery, not duplication. But it is hard to be sure what is happening without a case to reproduce it.
Best regards, Frank On Mon, Mar 19, 2012 at 12:37 PM, Martin Chapman <[email protected]> wrote: > Chaitanya, > > > > Thank you very much for your response. The problem seems to be with the > default SOURCE_EXTRA parameter of the GDALWarpOptions being defaulted to 1. > When I up that number everything works fine. I think the default for that > value should be larger. What do you think? > > > > Best regards, > > Marty > > > > From: Chaitanya kumar CH [mailto:[email protected]] > Sent: Monday, March 19, 2012 1:00 PM > To: Martin Chapman > Cc: [email protected] > Subject: Re: [gdal-dev] GdalWarp issue > > > > Martin, > > Change the resampling method and/or change the SAMPLE_STEPS warp option. > > On Tue, Mar 20, 2012 at 12:12 AM, Martin Chapman <[email protected]> wrote: > > All, > > > > Please see the attached sub-region screen capture of an image I created > using gdalwarp 1.9. I used MS Paint to highlight in red several columns of > pixels that repeat a pattern from left to right across the image (vertically > only) where the pixels are the same color for both pixel columns when in > fact they should be different. The problem seems to occur whether I am > going from source wkt (wgs84 in this case) to the same coord system or if I > go from wgs84 to another coord system. It only seems to happen when the > source image is in WGS84 though. > > > > Any help is much appreciated. > > > > Best regards, > > Martin > > > > > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > > -- > Best regards, > Chaitanya kumar CH. > > +91-9494447584 > 17.2416N 80.1426E > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, [email protected] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
