Observed arrival · 2026-10-18
A Travel Survey of One | Zhanchao Yang
A private iPhone app reconstructs one person’s day from location traces, turning stops and travel between them into visits, trips, modes, and trip chains.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Mobility researchers and location-data builders
- Worth noticing
- Stays of five minutes or more become visits; uncertain trips can be corrected in a tap, and corrections inform later guesses.
Field notes
The page describes GPS running while the user is moving, with geofencing and iOS location-monitoring features used to wake the app after stationary periods. Its data model keeps familiar survey units—such as person-day, trip, segment, purpose, and tour—so the creator can compare personal records with established survey datasets. The project also says corrected trips can influence later guesses on the same route.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
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