|December 12th, 2009|
|mbta, programming, tech, transport|
The grey lines are the shapes the mbta publishes in shapes.txt. They appear to be the commuter rail and rapid transit lines, including the silver line. The yellow dots are all the stops in stops.txt with an area proportional to the number of times they're listed in stop_times.txt, which I think corresponds to their service frequency. For single pixel stops this does not hold because all stops visited at least once get at least one pixel. I've cropped the image to leave out the ten most distant stops in each direction. The map is projected by calling the gps coordinates screen coordinates (after translation and scaling) which probably introduces some distortion. I merged stops that were really close.
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