I used -n flag. The surface is now more realistics and appears allineated to the narrower IDWs results: http://www.geospatial.it/allegri/IDW5.png<http://www.geospatial.it/allegri/IDW4.png>. I can't access your PhD thesis...
Giovanni 2008/2/13, Luigi Ponti <[EMAIL PROTECTED]>: > > Dear Paul, > > I have found your PhD thesis excerpt very interesting: thanks for > sharing it. > > Date: Tue, 12 Feb 2008 21:31:44 +0000 (GMT) > > From: Paul Kelly <[EMAIL PROTECTED]> > > Subject: Re: [GRASS-user] strange behaviour of v.surf.idw > > To: "G. Allegri" <[EMAIL PROTECTED]> > > Cc: grassuser <[email protected]> > > > > Also, have you tried running using the -n flag (no indexing) and > comparing > > the results. I think they should be the same for all regions then but > > might turn up something else interesting. > > > I started using v.surf.idw (for irregularly spaced points) in grass6.0 > with no -n flag, then in 6.1 I noticed that the output raster changed > from what it used to be (i.e., some stair-like artifacts appeared) and > it was restored to the original look (i.e., a much smoother look) by > adding the -n flag. By looking at your PhD thesis excerpt, it looks like > the -n flag should only make the interpolation faster: I wonder if you > have any idea why there may be differences, as you also say above. > > Kind regards, > > Luigi > > _______________________________________________ > 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
