On Wed, Jun 17, 2009 at 12:52 AM, Gregory, Matthew<[email protected]> wrote: > Hi all, > > A recent post got me thinking about resampling techniques. I've posted > a graphic to help illustrate my question. > > http://www.fsl.orst.edu/lemma/sandbox/resample.png > > In the graphic, assume the input image is the 3x3 grid with black > outlines and blue and yellow dot centers. Assume the red outlined > pixels represent three different output resolutions of a single pixel > each having its center at the black dot. > > Using bilinear interpolation, each of these three output resolutions get > the same value (tested using gdalwarp) based on the four yellow cell > centers. I understand why this is happening and realize this is the > expected behavior. > > My question, however, is whether or not there is a resampling technique > (inside or outside GDAL) that uses the proportional weights and values > of *all* input pixels touched by the output pixel.
This would be a great addition (especially for gdalwarp). I have to reproject population maps (LatLong, people/pixel) and a weighted approach should gain more precision, right? In GRASS, we have http://grass.itc.it/grass64/manuals/html64_user/r.resamp.stats.html -w: Weight according to area (slower) but that's not for reprojecting... Markus _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
