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I'm struggling to produce a map as follows: enter image description here

Basically, I am using Google Map APIs (JavaScript) to visualize my data. My data contains plenty of points. Each point has coordinates (lat, lng) and a value (pollutant). I've tried to use heatmap layer in Google Map but it looks ugly compared to this image. Here is my output using heatmap: enter image description here

So my question is what software/package/library can make the first picture? Many thanks.

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