The only option that you do *not* have is "mode" (the dominant value), which can be useful in the case of categorical (integer) data. That question has been answered here:
http://www.osgeo.org/pipermail/gdal-dev/2011-August/029692.html On Wed, Dec 14, 2011 at 1:35 PM, Travis Kirstine <[email protected]> wrote: > Andreas, > > Yes gdalwarp support various resampling methods > > To use different resampling methods use the -r flag followed by the method > > eg > > gdalwarp -r near .............. > gdalwarp -r bilinear ............. > > etc... > > > > > On 14 December 2011 08:26, Andreas H. <[email protected]> wrote: >> Travis, >> >> thanks for your answer! >> >> Regarding the resampling methods: Do they all just interpolate the data? I >> mean, when downsampling, usually I would use mean() or something similar >> to fill the new (coarser) grid cells. Doas gdalwarp actually do this and >> I'm not able to understand the documentation, or is it different? >> >> Thanks again! >> Andreas. >> >> >>> Andreas, >>> >>> gdalwarp can be used to resample images using the -tr flag or -ts flag. >>> >>> For example resample 1m image to 10m using cubic resampling and >>> "target resolution' >>> >>> gdalwarp -r cubic -tr 10 10 input_1m.tif output_10m.tif >>> >>> You may have an issue determining the output resolution as I believe >>> the resolution will be in decimal degrees rather than arc-seconds. >>> >>> Regards >>> >>> On 13 December 2011 14:52, Andreas H. <[email protected]> wrote: >>>> Hi, >>>> >>>> let's say I have a GeoTIFF file with a global grid in a 30 arc-second >>>> resolution. Which would be the appropriate GDAL command to spatially >>>> down-sample this file to say 0.125°? >>>> >>>> Thanks for your insight, >>>> Andreas. >>>> _______________________________________________ >>>> gdal-dev mailing list >>>> [email protected] >>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev >>> >> >> >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
