Hi Sylvain The mystery moves to why they didn't 'fix' it in the first place.I
noted that part of the Amazon Basin has a low overall stack-count.The QA file
that follows the geoTiff-data is populated with data (stack-numbers) in the
same format (geoTiff) .. that makes it possible to predict troubled areas. I'm
not sure if your GIS-tools can incoorporate and use the auxillery-data.
Carsten--------------------------------------------------------
Sylvain wrote: > Hi Carsten,
>
> It is almost certain that you are right.
>
> The chapter "C. Residual Anomalies and Artifacts GDEM" detailed
> "Artifacts Related to Stack Number Irregular Boundaries."
> - Decripiton of the "pits" is similar to more or less circular holes I
> see. The text says they "Regularity and Often Occur with high
> frequency in Virtually all ASTER GDEM tiles" and "from just a FEW
> meters to 100 meters or more." Ok
> - The large positive anomalies similar to "mole run" artifacts (p.23
> of the text).
> - Undoubtedly the linear artifact are "step anomaly" (p. 19 text).
>
> Thank you for your comments, I'll put them on the blog to let things clear.
>
> Bests
>
> PS: as you assume, unfortunately, no amazon mystery reveled...
>
> Sylvain
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