Add page to let user import GeoJSON file & visualize atop our data

[hathix]

Tools like this use GeoJSON to visualize and mash up visual datasets. One cool thing we could do with our data is overlay it with demographic/economic/other data to show interesting correlations, like Terence did with gyms in SF.

The easiest way to implement this is to:

• Add a new page.
• Let users import a GeoJSON file (here's an example), and show it on a map of SF. Render information on a color scale, or something.
• Create a new, subtle way to visualize our data. For instance, putting dots on the map where there are stops (stops with more buses are bigger). Or drawing black lines on the map for each Muni line (more opaque = more service).
• Create some sample GeoJSON datasets (like income level) that users can try on top of our data.