[GRASS-user] ASTER GDEM Version 2 ---> filtering and smoothing

[Alexander Muriy]

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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