[OSGeo-Discuss] 30m SRTM worldwide?

Sylvain JM Desmoulière syltao at gmail.com
Wed Aug 24 10:31:09 PDT 2011

I used a re-sampling to 30m of SRTM-DEM (made by Brazilian INPE) and observe
a visual superposition between GRASS-r.watershed river network output and
2001 Landsat7 deforested areas (the nearest date after SRTM) (see
As you suggest, I'll verify if CGIAR SRTM-DEM is better in such flat area
with forest/cultivation patchwork.
In first analyze, ASTER GDEM gave better river network, even with the theses
20-30m holes or larges areas artifacts!... but more job is necessary to
verify and understand why!


2011/8/24 maning sambale <emmanuel.sambale at gmail.com>

> +1 We conducted our own site specific comparison and we concluded that
> SRTM is much better especially those post-processed by CGIAR.
> >>
> >> Depending on where you are there are issues with ASTER GDEM:
> >> http://gis.cri.fmach.it/aster-gdem-quality/
> >>
> >> Markus
> >
> > Or in flat tropical area...
> > http://yepca.org/wp3/?p=303
> Thanks! Shared and bookmarked this site!
> --
> cheers,
> maning
> ------------------------------------------------------
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