Exercise

addPolygons() Function

Let's look at those zip codes with missing data to hypothesize why they do not have income data.

We are mapping ZCTAs (not actual zip codes) so not every part of NC will have a boundary. Our boundaries may overlap because the file was simplified to reduce size. These are trade offs to consider when mapping polygons.

Enough nuance, let's make a map. You can pipe the shp data directly into our calls to leaflet(), addTiles(), and addPolygons() without supplying any additional arguments to map North Carolina's zip codes. To get you started, the shp SpatialPolygonsDataFrame including the IRS income variables has been loaded for you.

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Map the polygons in shp using addPolygons().