[vtkusers] Interpolating scattered 2D data

[Kass, Mason]

This looks perfect.  Thank you both so much!

There were a few examples with terrain, it turns out, and in my haste I
missed the triangulate a terrain map.  I apologize for my oversight!

Have a great day
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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*Pluralitas non est ponenda sine necessitate.*


On Fri, May 17, 2013 at 6:19 AM, David Doria <daviddoria at gmail.com> 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
>
> Hi Andy,
>
> I just made an example of sampling/interpolating a set of points (that
> describe a f(x,y)-type surface) onto a grid here:
>
> http://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/InterpolateMeshOnGrid
>
> I hope it does what you were looking for.
>
> David
>
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