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How to plot Power spectral density vs. wavenumber for a two dimensional data

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math seeker
math seeker 2019-2-8
回答： Bjorn Gustavsson 2019-2-8
I have a two dimansional spatial data. The data is a matrix of the size 430 X 430 with a distance of 2 km between data points. I want to plot a curve of power spectral density of the data versus wave number. How can I do it in Matlab

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Bjorn Gustavsson
Bjorn Gustavsson 2019-2-8
Well for the power-spectral density of the entire image you can just look at the power of the 2-D fft:
fData = fft2(d); % pad with zeros as you see fit to avoid aliasing
imagesc(log10(abs(fftshift(fData)).^2))
HTH

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