The main focus when producing hexbin maps showing a full hex-cover of the resepctive country is on the data prep. The key steps of this approach:
1) Draw the map
2) Draw a point grid covering at least the map’s bounding box
3) Only keep points within country polygon (w/ d3.polygonContains())
4) Merge point grid data with data to visualise (walmart data from here)
5) Calculate hexbins with d3.hexbin()
6) Draw hexbin map
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forked from larsvers‘s block: hexbin map