Hello, dear GRASS users. A few words about new ASTER GDEM version 2<https://lpdaac.usgs.gov/about/news_archive/monday_october_17_2011> .
As was explored, this DEM could be also rather well filtered and smoothed with the Sun's denoising algorithm<http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/>(using <GDAL> and free / open source program <mdenoise>). Also there is GRASS add-on r.denoise <http://grass.osgeo.org/wiki/GRASS_AddOns#r.denoise>. Experiments showed that the best smoothing of ASTER GDEM 2 is reached with such parameters of <mdenoise>: threshold = 0.8 iterations = 10-20 Also filtering with <r.neighbors> by "average" method and window size >=5 is quite usefull to remove some noise from DEM. ----------------------------------------------------------- With the best regards from Russia, Alexander Muriy.
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