How do I smooth out a surface distribution plot?

Question

Leon 2014-10-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157972-how-do-i-smooth-out-a-surface-distribution-plot

评论： Leon 2014-10-11

采纳的回答： Bruno Pop-Stefanov

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Looks like my data has some outliers that should be removed.

Instead of doing that manually, is there a way I can let Matlab do it? Thanks!

In case you need, below is the code to plot the map:

[X, Y] = meshgrid(linspace(min(lon),max(lon),100),linspace(min(lat),max(lat),100));
Z = griddata (lon, lat, V, X, Y);
[C1, h1] = contourf (X, Y, Z, [0:0.1:4], 'LineStyle', 'none' );

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Answer 1

Bruno Pop-Stefanov 2014-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/157972-how-do-i-smooth-out-a-surface-distribution-plot#answer_154729

There is no off-the-shelf functionality in MATLAB that allows you to detect outliers in data. Techniques exist but it is still an active field of research.

You'll find a couple of File Exchange submission to remove outliers from data. For example:

http://www.mathworks.com/matlabcentral/fileexchange/37211-remove-outliers

Otherwise, you could maybe try to filter your data with a smoothing filter. Take a look at the filter function:

http://www.mathworks.com/help/matlab/data_analysis/filtering-data.html

This will reduce the magnitude of peaks in your data.