[GRASS-user] RE: v.vol.rst output parameters

[Vivian Athaydes Canello]

Hi ,
> >> > I'm working with a database for the three-dimensional interpolation in
> >> > GRASS which is composed of data ranging from 0 to 100, and
> >> > coordinates x,y,z, to conduct a zoning 3D attribute.
> >> > I'm using v.vol.rst, but I'm having trouble finding the best
> >> > parameters for 3D interpolation.
> >> >
> >> > I realized several simulations varying the parameters npmin,segmax, tension and smooth.
> >> > However, using as example the default parameters of v.vol.rst (tension =
> >> >
> >> > 40, smooth = 0.1, = 50 segmax, npmin = 200 and dmin= 0.5) the results generate voxels with an
> >> > average of 77 and standard deviation equal 8.
> >> > But most of my input data is close to a range of values from 90 to
> >> > 100 (46% of vector points), but the volume voxels generated for
> >> > this interval has a ratio of 3%.
> >> > How these parameters influence the equation of the spline v.vol.rst?
> >> > What parameters could be influence this result?
> >> > Whereby the highest percentage of interpolated values is
> >> > between the range of values from 75 to 90 and not 90 to 100.
> >> > Why are the values from 90 to 100 may be having a small weight in
> >> > the interpolation?
> >> >
> >> > Thanks
> >> > Vivian
> >> >
> >> >
> >> >
> >
 		 	   		  
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