Choropleth map with latitude and longitude

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I have the lat,long co-ordinates of all crime spot in a city. I wanted to create a choropleth map based on the data. I figured out how to generate map tiles and serve them using mapnik.

How can i group the individual points of crime and color code the polygons in choropleth map based on crime count.

Eg: If the polgon in map has 5 crimes then it must be red, if another polygon has 0 crimes then it must be green.



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