Thanks for your answer Markus! Here are my thoughts and trials:
The normal screen output when running v.surf.bspline looks something like this: Reading values from attribute table... Initializing output... 100% Load masking map 100% Processing subregion 1 of 25... 90% ## ..but when running with ew_step=50 and ns_step=1000, I get: Reading values from attribute table... Initializing output... 100% Load masking map 100% 100% 100% 100% 10% ... and it does not seem to finish at any point. Even setting the ew_step=90 generates the same behaviour. My result with 100 and 1000 is not that bad actually - I might say I'm happy with that. I am experimenting with v.surf.rst, but for some reason it ignores a lot of points (to dence). I also don't know if I understand the theta and scalex parameters. For me, it seems they are optimizing the results from a "feature" that is anisotropic. Does this "feature" in my case mean my area with samples that I wont to interpolate? My area is somewhat rectangular - being about twice the size in the nort-south direction, but my data - as I mentioned , are spaced by 50 m in the e-w direction and 1000 m in the n-s directions. So what combo of theta and scalex should I use? Thanks! Martin _______________________________________ Fra: Markus Metz [[email protected]] Sendt: 17. desember 2014 22:11 Til: Martin Album Ytre-Eide Kopi: [email protected] Emne: Re: [GRASS-user] Interpolation method for parallel samples Martin Album Ytre-Eide wrote: > Hello! > > I have airborne gamma measurements obtain in lines. The spatial distance > between the 'points' along the line is 50m (e-w direction) and the spatial > distance between the lines is 1000m (n-s direction) > > I am currently experimenting with the v.surf.bspline function - setting > ew_step=100 and ns_step=1000. I am having trouble setting the ew_step any > lower.....? What exactly is the trouble with setting ew_step any lower? In theory, it should be possible to set ew_step to any value. Markus M > I am also using the smoothing parameter lambda_i. > > If anyone have some interpolation tips with this type of data - I would be > happy to hear about it. > > > > Martin > > _______________________________________________ > 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
