I am trying to analyze the sinusoidal surface of a lava-flow for dominant wavelengths/frequencies using the FFT command. I made traverses of the lava-flow to have 2 dimensional elevation data which is stored in a vector. I read a lot about this function but don't understand yet how to use it for my purpose. All the examples on the web define a sampling frequency in the beginning but in this particular example I just have a vector with a datapoint every meter. So as I don't generate the sinusoidal wave myself I don't know all the parameters like sampling frequency etc. It is just an irregular wave.
Can somebody help me out with that? Is the fft a good approach for this project? Should I just define any random sampling frequency?
Thanks a lot, I am kind of new to the fft-function. yves