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To reply to myself, it looks like it's rendered client side - the json just returns a bunch of points and the heatmap must be canvas.

See the json here: http://s3-media3.ak.yelpcdn.com/wordmap/2/words/sf/dim-sum.j...



Yes - good client side JS to do this has only been around for a year or so. Before that it was ESRI, or map tile complexity...




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