Joaquim, > nearneighbor is not really a good thing to use. Grid it with surface.
What do you mean by "grid it with surface"? In my GDAL (1.8.1), I only have the following choices: Available resampling methods: near (default), bilinear, cubic, cubicspline, lanczos. thanks for your insight, Andreas. > > Joaquim > > Sent from my iPadiola > > On 14/12/2011, at 18:32, "Andreas H." <li...@hilboll.de> wrote: > >> 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 >> > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev