Efficient method of calculating density of irregularly spaced points

Question

I am attempting to generate map overlay images that would assist in identifying hot-spots, that is areas on the map that have high density of data points. None of the approa

Answer 1

Just a note, the histogram2d function should work fine for this. Did you play around with different bin sizes? Your initial histogram2d plot seems to just use the default bin sizes... but there's no reason to expect the default sizes to give you the representation you want. Having said that, many of the other solutions are impressive too.