Hi Carsten, I am afraid that this mystery relates to cost/available budget matters!
Jean-Philippe ________________________________________ De : discuss-boun...@lists.osgeo.org [discuss-boun...@lists.osgeo.org] de la part de Carsten Troelsgaard [troelsgaard...@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. 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 _______________________________________________ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
