[gdal-dev] Re: gdalwarp interpolation artifacts

Roger André randre at gmail.com
Tue Sep 30 01:18:05 EDT 2008

Further testing shows that the artifact seems to show up at consistently at
x=6000 and x=12000 columns.

On Mon, Sep 29, 2008 at 7:30 PM, Roger André <randre at gmail.com> wrote:

> 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
> artifacts.
> 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.
> Roger
> --
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