That was the other method I was trying, reading the VRT file into memory using the new (to me) xml.etree.ElementTree lib. I was missing the <AveragedSource> tag, though, thanks.
2009/4/1 Klokan Petr Přidal <klo...@klokan.cz> > Hi Chris, > > You have two options in GDAL API for resampling via Python: > > gdal.RegenerateOverview() with 'average' and 'mode' algorithms. > and > gdal.ReprojectImage() with 'bilinear','cubic','cubicspline' and > 'lanczos' algorithms. > > Example of such functionality is in gdal2tiles.py in function > GDAL2Tiles.scale_query_to_tile(): > > http://code.google.com/p/maptiler/source/browse/trunk/maptiler/gdal2tiles.py#1433 > > I am resampling in memory (because I am working only with small tiles > with usual size 256x256px): > > mem_drv = gdal.GetDriverByName( 'MEM' ) > target = mem_drv.Create('', outputXsize, outputYsize, bands) > > I think gdal.ReprojectImage() would be able to rescale also into VRT > dataset. > > Another choice is to create copy into the VRT dataset and change the > target raster size in XML attributes manually in the text. > In that case the average algorithm in VRT is exposed by the > <AveragedSource> tag... > > Best, > > Klokan > > 2009/4/1 Chris Somerlot <csomer...@gmail.com>: > > Having trouble figuring out how to resample an image to a different cell > > size from python. I looked over the VRT driver page and have been trying > to > > get this to work: > > > > from osgeo import gdal > > > > gdal.AllRegister() > > > > src = gdal.Open('DOQ_test.TIF') > > drv = gdal.GetDriverByName('VRT') > > dst = drv.CreateCopy("", src, 0) > > > > dst.RasterXSize = '125' > > > > But it seems the cell size in the datasets and the bands are read only? > Is > > there any programmatic way to do this? > > > > _______________________________________________ > > gdal-dev mailing list > > gdal-dev@lists.osgeo.org > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > -- > http://blog.klokan.cz/ > http://www.maptiler.org/ > http://www.oldmapsonline.org/ >
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