Hi John, I want to try your module with my srtm data, but I always get out of memory messages. Maybe I am just to ambitious with my region settings :-) , but could you provide some hints on general memory usage?
Or should I program a script for a moving window so I get smaller regions? Are there any problems then on the connecting borders, e.g. differnently smoothed surfaces at the edges? // messages and script call ... r.denoise in=dgm out=dgm_denoise iterations=5 threshold=0.99 ... n1: 5 n2: 50 Read Model... Triangulation... Error: Out of memory. Many thanks Frank On Monday 17 August 2009 17:35:15 John A Stevenson wrote: > 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 _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user