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Old   October 4, 2003, 05:14
Default 2D-Interpolation
Don Tron
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Hi all,

I need to perform two-dimensional interpolation from nonrectangular grid to other nonrectangular grid. Would you help me with algorithm?

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Old   October 4, 2003, 12:37
Default Re: 2D-Interpolation
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2 steps:

1. interpolate nonregular grid values to a regular grid

2. interpolate to get the other nonregular grid values from the regular grid
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Old   October 4, 2003, 13:54
Default Re: 2D-Interpolation
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The simplest method is to just do bilinear interpolation from the first nonuniform grid onto the points in the second grid. The algebra is a bit tedious but straightforward. This method doesn't care if the second grid is uniform or not. However, things get much harder if you have special requirements, such as high accuracy, a function that is not smooth, or you need to match some constraint such as conserving mass when you interpolate a density field.
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Old   October 30, 2003, 04:40
Default Re: 2D-Interpolation
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you can try least square in 2d. it can satisfy the accuracy's requirement
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