[gdal-dev] gdalwarp vs gdal_translate for resizing images
traviskirstine at gmail.com
Thu Oct 27 07:17:33 PDT 2016
Thanks for your response. I rechecked by results and it appears that the
difference may be related to the GDAL version. I had originally been
testing using gdal 1.7.3 for the gdalwarp command and gdal 2.1.1 (osgeo4w)
for the gdal_translate command. If I run both command using gdal 2.1.1 the
result appear the same.
On 27 October 2016 at 09:48, Even Rouault <even.rouault at spatialys.com>
> Le jeudi 27 octobre 2016 15:02:11, Travis Kirstine a écrit :
> > I've been looking at resampling high resolution orthophoto images (0.10m)
> > using gdalwarp vs gdal_translate to a lower resolution
> > gdalwarp -co TILED=YES -srcnodata "0 0 0" -dstnodata "0 0 0" -tr 2 2
> > bilinear in.tif warp_2m_bilinear.tif
> > compared to
> > gdal_translate -co TILED=YES -a_nodata 0 -tr 2 2 -r bilinear input.tif
> > translate_2m_bilinear
> > It appears to me that gdal_translate produces a much "better" result with
> > reduced aliasing. Why would the results differ?
> Does gdalinfo on the output of both files report the same spatial extent ?
> gdalwarp and gdal_translate have different logic to compute it when not
> explicitly mentionned.
> Spatialys - Geospatial professional services
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