On Mon, Jan 5, 2015 at 11:51 AM, Martin Album Ytre-Eide <[email protected]> wrote: > 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%
Oops. > > ... and it does not seem to finish at any point. That is a bug. Can you please open a ticket for this and add an example using the North Carolina sample dataset? I guess this bug will appear with any input data as long as ns_step and ew_step are sufficiently different. Markus M > > 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
