[vtkusers] Interpolating scattered 2D data

[Bill Lorensen]

Look here:
http://vtk.org/Wiki/VTK/Examples/Cxx/Filtering/TriangulateTerrainMap


On Thu, May 16, 2013 at 5:58 PM, Kass, Mason <mkass at usgs.gov> wrote:

> 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
>
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