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Thanks! I am hoping to add a heat map. And yes the data is from Socrata's Open Data Platform API (https://nycopendata.socrata.com/Social-Services/Rat-Sighting...)

Have you considered a chloropleth[1]? Similar effect to a heat map but likely much easier to implement.

Just shade each of your already defined regions by [sightings/area].

[1] http://en.wikipedia.org/wiki/Choropleth_map

I hadn't for this project - to be honest I didn't have a clear plan for this project, it was just something I threw together in a few hours for fun because I thought the dataset was amusing :) A chloropleth is a great idea though. If I find the time to improve this, I'll definitely keep that in mind!

Anyone manage to get a screenshot? jsbin says it has expired.

http://jsfiddle.net/955x2w5a/embedded/result/

Oh shit the LES is pretty damn red