Mapping Bus line 85 Michael Alexander Hoklan Hau

Motivation Public transportation provides many societal benefits Madison’s public transportation system is confusing to use – Lead to underutilization

Hypothesis By making navigation of the city of Madison’s bus service more accessible, we can increase participation

Methods Equipment – 3 handheld GPS recievers (Garmin etrex) – Digital Camera – GPS Software and PC Fieldwork – 3 waypoints for each bus stop – 5 min at each waypoint – Photo of each bus stop

Methods Cont. Data Analysis – Data download – Matlab Average coordinates Statistics and error calculations Google Maps Integration – Import waypoints – Photo-tagging – Interactive timetable

Overview GPS Receiver GPS Waypoints Matlab Analysis Google Earth KMZ file with timetable and photographs Google EarthMetro Timetable Digital Photos

Project Specification Absolute Accuracy of 6m – Bus usually stops within ~6m of sign – Rte. Markers usually within plain sight Interactive Google Map – Route – Picture – Timetable link

Results Average Error: 5.24m Outlier: Lake and Langdon – Error: m – Visual Inspection revealed two waypoints at a considerable distance from ground position

Waypoint: 8505 Loc: Randall & Eng. Drive Coords: , NS Error: 2.95m EW Error: 0.79m Avg. Error: 1.87m Waypoint: 8500 Loc: Lake & Langod Coords: , NS Error: m EW Error: m Avg. Error:330.95

Final Bus Map

Google Maps

Conclusions Needed more waypoints and follow-up measurements to increase accuracy Allot more time to fieldwork Silver Etrex is better and easier than yellow

Future Work Map all bus stops in Madison Integrate with online timetable search – Bus Stop IDs in metadata – Algorithm for directions / transfers Look at bus users before and after interactive bus map

Questions?