[GRASS-user] New addon: r.denoise. Denoise topography including SRTM

[John A Stevenson]

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.stevenson at manchester.ac.uk