Hi Travis, >From a purely subjective standpoint, I feel that the bilinear resampling method works the best with aerial photo data. You can test this using gdalwarp:
gdalwarp -ts <x_size> <y_size> -r <resampling_method> <infile> <outfile> But before you resample all your data, you might try adding the following processing directive to your imagery layer: PROCESSING "RESAMPLE=BILINEAR" You might find that this improves things enough. Roger -- On Wed, Mar 4, 2009 at 6:54 AM, Travis Kirstine <[email protected]> wrote: > We are running mapserver connected to a tilecache delivering high > resolution orthophoto to a google maps. The problem I am having is > that we preprocess all our imagery using reduced resolutions at higher > scales and full resolution at lower scales. In the past we have used > gdal_merge with - ps 10 10 to merge tile into larger overalls and > downsampling the resolution but we have found that the image quality > was not adequate. I have been experimenting with gdalwarp using the > different resampling methods with varied results. Is there any > consensus on which resampling method provided with gdal provide the > optimal results (from a viewing perspective) when downsampling imagery > data? > > -- > Travis K. > > Toronto, Canada > ------------------------------------------------------------ > "She knows there's no success like failure > And that failure's no success at all." > -Bob Dylan- > ------------------------------------------------------------ > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
