[gdal-dev] gdalwarp interpolation artifacts

Roger André randre at gmail.com
Mon Sep 29 22:30:15 EDT 2008

Hi List,

I've hit the same problem twice now, and I'm pretty certain after Round 2
that I'm not introducing it.  Basically, I'm using gdal_merge.py to mosaic a
group of low-resolution, 32-bit floating point rasters together, then
running "gdalwarp -ts xxx yyy -r cubicspline" on the mosaic to get a higher
resolution image.  I'm finding afterwards that there are linear artifacts in
the mosaic which run vertically through the mosaic, which look like edge
artifacts, but which are not located near the edge of either an original
low-res tile, or the resulting high res one.  I've tested the interpolation
of a single low-res tile in the area where the artifact is present in the
mosaic and I do not get the same results - the interpolated tile is clear of

Is it possible that I'm hitting some sort of memory limit that is causing
only a certain number of columns to be interpolated at one time, rather than
the entire row?

Thanks in advance for any clues or advice you can give.

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