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Wrong result with bilinear interpolation

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Old   June 12, 2007, 06:02
Default Wrong result with bilinear interpolation
  #1
zonexo
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I am trying to do interpolation using bilinear interpolation, transfer u,v values from 1 structured grid to another.

I found that for different orientation of the pts, I may get coefficients which are of the order 1e-1 or 100. Those with 1e-1 give good ans but those of order 100 usually results in the wrong interpolated value.

I've check thru and it seems that there's no programming errors. Usually just 1 or 2 pts out of 100 doesn't interpolate well. Is this possible? Or is there anyway I can avoid it from happening?

Thank you.

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Old   June 12, 2007, 15:55
Default Re: Wrong result with bilinear interpolation
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Ananda Himansu
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Yes, it is entirely possible to get poor interpolation for some range of orientation of the mesh. Interpolation in more than one dimension is not as nicely behaved as the one-dimensional case. There is no watertight solution, but you may look at transfinite interpolation.
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