If you need complete control, and your data are not too massive in number, I have had good results pushing pixel coordinates as points into postgis and then using spatial queries to aggregate in various ways (eg averages a hexagonal grid). It seems round-about, but it works. I've actually done it on some pretty massive grids.
THK On Wed, Dec 14, 2011 at 7:26 AM, 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 -- Timothy H. Keitt http://www.keittlab.org/ _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
