[OSGeo-Discuss] 30m SRTM worldwide?

Jean-Philippe Lagrange Jean-Philippe.Lagrange at ign.fr
Sat Aug 27 17:18:23 PDT 2011

Hi Carsten,

I am afraid that this mystery relates to cost/available budget matters!


De : discuss-bounces at lists.osgeo.org [discuss-bounces at lists.osgeo.org] de la part de Carsten Troelsgaard [troelsgaard53c at live.dk]
Date d'envoi : samedi 27 août 2011 09:55
À : lists.osgeo.org
Objet : RE: [OSGeo-Discuss] 30m SRTM worldwide?

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.


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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