I recall Hamish once released an interpolate with barriers code that I believe it's in the addons.
Never used it myself but you should take a look http://lists.osgeo.org/pipermail/grass-user/2008-February/043541.html The screenshot is very neet and looks like what you want to do. Just don't know about the 3d interpolation though. I think it's just 2d.... http://grass.osgeo.org/wiki/File:Inlets_03_SurfSal_icw_big.png Cheers Daniel On Tue, Nov 17, 2009 at 8:28 AM, Margherita Di Leo <[email protected]> wrote: > Hi Ulrich, > > AFAIK the algorithm to calculate the hydrological distance is actually > r.stream.distance. > > Hope this helps > > Margherita > > Date: Tue, 17 Nov 2009 10:52:45 +0100 From: Ulrich Leopold > <[email protected]> Subject: [GRASS-user] Spatial interpolation of > river network observations To: R-sig-geo list <[email protected]>, > [email protected] Message-ID: <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Dear all, > > I would like to interpolate 17 pollution observations in a storage lake in 3 > dimensions (x,y,z). > > As I understand variogram analysis and kriging are not straightforward as we > are dealing with non-euclidean (hydrologic) distances and down-stream > direction. > > Could someone point me to some algorithms which can roughly estimate the 3d > pollution body accounting for hydrologic distances? > > -- > Eng. Margherita Di Leo > Ph.D. Candidate > Methods and Technologies for Environmental Monitoring > Department of Environmental Engineering and Physics (DIFA) > > University of Basilicata Campus Macchia Romana > 85100 - Potenza Italy > > Office: +39-0971205363 > Fax: +39-0971205160 > > > > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
