[vtkusers] Interpolating scattered 2D data

[Kass, Mason]

Good afternoon,

I'm having a problem which seems like it probably has a pretty simple
solution, but I can't for the life of me get a code that works.  I'm quite
new to VTK, so not understanding the theory behind the examples isn't
helping me much.

Essentially, all I am trying to do is interpolate scattered terrain data
onto a regular mesh, very similar to using meshgrid and griddata in Matlab
(in fact identical).  I have a forum post here that shows what I'm trying
to do (including pictures) and what I've tried in some detail:
http://forum.codecall.net/topic/75495-c-using-vtk-to-interpolate-terrain-data/

I was unable to follow the interpolate terrain example, as it used regular
data.  I THINK what I need to be using is the Shepard Method.  I've
downloaded and played with the example, but the outputs are contours; I
need to be able to grab the interpolated point at particular locations
(also it's in 3D instead of 2D, but I think I can overcome that).  I should
also note that I need to interpolate everywhere within the domain--NaNs or
fillers are not acceptable.

If anyone has any advice or a tutorial they can point me to, I would be
most appreciative.  The forum link above shows where I got stuck in my
code, as well as having the matlab code that does what I want and a picture
of what I'm trying to get.  I didn't reproduce it on the email list to
avoid sending large attachments to the email users--please let me know if
that was an incorrect approach.

Thank you so much for any help you can provide.

Cheers
Andy

----------------------------------------------------------------------------------
Mason (Andy) Kass, PhD
Research Geophysicist
Crustal Geophysics and Geochemistry Science Center
US Geological Survey

PO Box 25046 Federal Center MS 964
Denver, CO 80225-0046

+1 303.236.1884
mkass at usgs.gov

Public calendar:
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