
From:  Nicklas Karlsson 
Subject:  Re: Interpolation on scattered data 
Date:  Mon, 23 Mar 2020 15:47:27 +0100 
>linear, cubic, and natural methods are all triangulation based. they take
>the scattered points, use octave's delauney triangulation, then calculate
>local interpolants within the triangles. linear (actually bilinear i guess)
>is simply a weighted some of triangle areas (the interpolation point
>creates three subtriangles within the mesh triangle, and value is a
>weighted projection inversely proportional to subtriangle size, where a
>big subtriangle has you more strongly weighted toward the point not
>associated with that subtriangle). the v4 method does not triangulate,
>and does a weighted interpolation over the entire mesh. that can get slow
>and memory intensive, but it's currently the only 'smooth' interpolation
>function Octave has implemented (sort of).
Have you considered Kriging? I have used the stk package from
Octaveforge with profit.

Francesco Potortì (ricercatore) Voice: +39.050.621.3058
ISTI  Area della ricerca CNR Mobile: +39.348.8283.107
via G. Moruzzi 1, I56124 Pisa Skype: wnlabisti
(gate 20, 1st floor, room C71) Web: http://fly.isti.cnr.it
[Prev in Thread]  Current Thread  [Next in Thread] 