Travis, yes, thanks, I had already found that in the documentation. I'm just wondering what e.g. 'bilinear' means when I go from a fine to a coarse grid? If GDAL works in terms of "nodes", then I would assume 'bilinear' means interpolation, which in turn would be a very different result from working in terms of "cells" and then taking e.g. the average of all "old" cells in the "new" grid.
I hope you see my problem / question. Thanks for you insight, Andreas. Am 14.12.2011 16:35, schrieb Travis Kirstine: > 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. <li...@hilboll.de> 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. <li...@hilboll.de> 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 >>>> gdal-dev@lists.osgeo.org >>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev >>> >> >> >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev