Bus Plotter IV: Extrapolate From Stop Predictions

September 26th, 2010
mbta, mbtaplot, programming, python, tech, transport
I've made the plotter now take advantage of the "predictions" command offered by the webservice that tells you how many minutes it will be before a specific bus arrives at a given stop. Instead of doing linear extrapolation from the previous two reported positions it uses the previous position and an upcoming stop. I first tried using the next stop to do predictions, but because the webservice only provides data at the minute level, this was much too inaccurate and I switched to using a threshold of two minutes out. There might be multiple stops two minutes out, so we break ties by taking the closest one to the last known bus location.

See it in action: mbtaplot

Recent posts on blogs I like:

Pay For Fiction

Against piracy

via Thing of Things February 29, 2024

When Nurses Lie to You

When the nurse comes to give you the flu shot, they say it won't hurt at all, right? And you trust them. Then they give you the shot, and it hurts! They lied to you. A lot of nurses lie to children about shots and blood draws. Part of it is they probabl…

via Lily Wise's Blog Posts February 28, 2024

How I build and run behavioral interviews

This is an adaptation of an internal doc I wrote for Wave. I used to think that behavioral interviews were basically useless, because it was too easy for candidates to bullshit them and too hard for me to tell what was a good answer. I’d end up grading eve…

via benkuhn.net February 25, 2024

more     (via openring)