analysis - create map summarizing isochrone results

[sidetrackedmind]

Goal

Imagine placing the pin everywhere in Portland and calculating the coverage area of a certain travel time band. For instance, in the picture below:

Imagine calculating the total area of the blob up to the pink 40-45 minute gradient. Then do this for a bunch of points around the city and come up with a table like this:

place_id	lat	lon	coverage area (sq mi)
A	XX.XX	XX.XX	XXX.X
B	XX.XX	XX.XX	XXX.X

Then use the above table to visualize transit access "deserts" around the city.