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

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

Answer 1

[Bjorn Gustavsson]

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