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Re: Interpolation on scattered data

From: Julien Bect
Subject: Re: Interpolation on scattered data
Date: Mon, 23 Mar 2020 16:19:29 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

Le 23/03/2020 à 14:57, Francesco Potortì a écrit :
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 sub-triangles within the mesh triangle, and value is a
weighted projection inversely proportional to sub-triangle size, where a
big sub-triangle has you more strongly weighted toward the point not
associated with that sub-triangle).  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
Octave-forge with profit.

Happy to read that ;-)

I'm sorry I haven't been following this thread carefully, but if anybody needs help to perform scattered-data interpolation with stk, feel free to ask here or on address@hidden.


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