Smoothing contour plot of isotherm

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주희 박
주희 박 on 16 Feb 2022
Commented: DGM on 17 Feb 2022
Hi i have an argo data and I'm trying to make isotherm line. I choose 1999~2004 winter data and interpolation 1m.
And I want to more smooth isotherm line. Additionally, I'm so beginner of matlab. Thank you for considering.
  • And Zi has NaN values, I guess this is cause. Why my zi has NaN......
  1 Comment
AndresVar
AndresVar on 17 Feb 2022
I have question about removing nan from b. The shape of b is 2D right? Otherwise it could have large discontinuity.
Instead of interp1 you could try the Damien Garcia's inpaint (for 2D b):
Or
I am not familiar for why griddata gives you nan, could it be because b is not smooth and has very large noise.

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Accepted Answer

DGM
DGM on 17 Feb 2022
I don't have your data, and your code is a picture, so I can't do anything with it.
That said, it looks like the problem is merely the size of the ZData.
Consider the example:
Z = peaks(10); % a very small array
contourf(Z,10);
figure
Z = peaks(100); % a larger array
contourf(Z,10);
You should be able to change this resolution by reducing the stepsize when you generate the Xp and Yp vectors.
  2 Comments
DGM
DGM on 17 Feb 2022
If you find that the answer satisfies your question to your satisfaction, you can click Accept. That way the question will be moved to the "answered" queue, where it may be more valuable to the next person searching for help with a similar problem.

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