topoJSON for county, zipcode, census tract

[DennisGoldfarb]

Need them for Missouri and Illinois. This will require downloading the shape files, converting them to geoJSON, then to topoJSON, and filtering for only Missouri and Illinois at some point in the process.

They'll be used for visualizing the geographic regions and also for estimating the demographics of a user defined region. The demographics for the patients we can get from the patient data, but it would be interesting to know if the patients demographics are different from the region's demographics. To get the demographics of a user defined region we'll need to compute the area of intersection with the census tracts and take a weighted average of the tract demographics.

[itlackey]

Going to work on adding the topoJson overlay feature as a foundation to work from

[DennisGoldfarb]

Great!