I have a data set of spectrograms from moving audio recorders. As the recorders get closer, I expect the spectrograms to become more "similar". I expect this "similarity" to be a function of distance and frequency.
I would like to create a 3d plot or image that has distance and frequency on the x and y, and "similarity" on z. I am not sure how to define this similarity. Is there a standardized way of comparing similar signals in this way?