I have a real 2D Array (Nx,Ny) of some variable, let’s say absolute vorticity. I perform a 2d fft on the matrix by: fc_2d = FFTW.r2r(arr,FFTW.R2HC) which returns a 2d matrix of the same size of Fourier coefficients. I want to do a 2d low pass filter by zero-ing out the scales greater than wavenum…

An example with GMT.jl using GMT # Download a Geoid grid G = grdcut("@earth_geoid_02m", region=(-40,-20,32,45)); #Filter with Boxcar (low pass wavelength > 500 km). ´f=:g´ is to infor that grid is in geogs, `N=:a` is to select best FFT dims( Gf_box = grdfft(G, F="-/-/500000/500000", N=:a, f=:g);…

How to Filter 2D Fourier Coefficients

New to Julia

jipolanco March 26, 2024, 9:59am 10

Exactly!

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How to Filter 2D Fourier Coefficients

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