How to draw a heat map of New York city community based on certain data using R? <p>For a project I am currently working on, I have to draw a heat map of New York city community based on certain input using R. I googled for this topic and found that in R, there is a package called "map" will allow you to draw a heat map of the states of US pretty easily. However, I have no clue about how to draw similar heat maps for a city, and specifically here, New York city? Any suggestion is highly appreciated.</p>