Hi,
I've uploaded a new module, r.denoise, to the addons repository. The
module can be used to remove noise/speckle from DEMs including SRTM
data. Removing noise can improve the results from other modules e.g.
r.watershed, r.slope.aspect. Compared to mean/median filtering with
r.neighbors, r.denoise makes much smaller changes to the data and is
able to preserve sharp edges.
The module is most easily installed on grass-6.5.svn via the command:
g.extension r.denoise
however, being a shell script, it can also be downloaded and copied to a
directory on the path.
Further information:
Addons page:
http://grass.osgeo.org/wiki/GRASS_AddOns#r.denoise
Article in press in Geomorphology describing use of the denoising
algorithm on Lidar, TOPSAR and SRTM.
http://dx.doi.org/10.1016/j.geomorph.2009.07.006
Enjoy,
John
--
Dr John Stevenson
Postdoctoral Research Associate
School of Earth, Atmospheric and Environmental Sciences
Williamson Building (Room 2.42)
University of Manchester
Manchester M13 9PL, UK
tel. +44(0)161 306 6585; fax. +44(0)161 306 9361;
john.steven...@manchester.ac.uk
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