[pveugen]

Good point. I played around with different decay times a lot, but it was very hard to settle on a decay time and opacity settings that worked for most cities, since the data set from city to city was varying in size. If I would re-render the movies, I'd definitely do try renders with lower decay times, especially for cities like NY, LA, etc.

[saraid216]

It might be interesting to see whether or not an ideal decay time correlates with anything.

[mahesh_rm]

Using a wavelet time frequency analysis is what they generally do to highlight these kinds of patterns when dealing with brain activations of neural populations. It gives you an idea of power of a specific frequency over time [e.g., http://www.lauriefrick.com/wp-content/uploads/2011/07/wavlet...]. And apparently it's already been used for analogous purposes: [ http://www.paramics-online.com/downloads/technicaldocs/wavel...] :-)