How to determine the dominant length scale for smoothing in a spatial measurement signal?

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TA le 16 Oct 2019

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https://fr.mathworks.com/matlabcentral/answers/485585-how-to-determine-the-dominant-length-scale-for-smoothing-in-a-spatial-measurement-signal

inst_vel.mat

Hello,

I have a velocity signal along vertical direction in a flow (attached). It is uniformly sampled data with a spacing of 0.2 cm between each point (from y = 1 cm to y = 204.8 cm). I need to understand how I can smooth this signal, specifically what scales should I filter out? My idea was to use a FFT based analysis to understand what scales are dominant in the signal and then filter the ones that cause noise.

How can I do this? Am I thinking in the right direction?

Any help would be appreciated.