Traffic Data Visualization Shashi Shekhar Spatial Database Lab

Traffic Data Visualization Shashi Shekhar Spatial Database Lab Department of Computer Science University of Minnesota shekhar@cs. umn. edu Http: //www. cs. umn. edu/research/shashi-group/

Dimensions n Available • • n TTD : Time of Day TDW : Day of Week TMY : Month of Year S : Station, Highway, All Stations Others • Weather, Seasons, Event types, …

Traffic Dimensions

Subsets of Dimensions TTDTDWTMYS TTDTDW TDWS STTD TDW S

Singleton Subset TTD Configuration: § X-axis: time of day; Y-axis: volume § For stations sid 138, sid 139, sid 140, on 1/12/1997 Trends: § Station sid 139: rush hour all day long § Station sid 139 is an S-outlier

Singleton Subset: TDW n Configuration: n n n Trends: X axis: Day of week; Y axis: Avg. volume. For stations 4, 8, 577 Avg. volume for Jan 1997 §Friday is the busiest day of week §Tuesday is the second busiest day of week

Singleton Subset: S Configuration: § X-axis: I-35 W South; Y-axis: Avg. traffic volume § Avg. 5–min traffic volume for January 12, 1997 Trends: n n High avg. traffic volume from Franklin Ave to Nicollet Ave Two outliers: 35 W/26 S(sid 576) and 35 W/TH 55 S(sid 585)

Dimension Pair: TTD-TDW Configuration: n n Trends: n n n X-axis: Time of day; Y-axis: Day of week f(x, y): Avg. volume over all stations for Jan 1997 Evening rush hour broader than morning rush hour Rush hour starts early on Friday. Wednesday - narrower rush hour

Dimension Pair: S-TTD Configuration: n n n X-axis: Time of day Y-axis: Highway I-35 W North Bound f(x, y): Avg. volume over all stations for 1/15, 1997 Trends: § § § 3 -Cluster • North section: Evening rush hour • Downtown area: All day rush hour • South section: Morning rush hour S-Outliers • station ranked 9 th • Time: 2: 35 pm Missing Data

Post Processing of Cluster Patterns Clustering Based Classification: § Class 1: Stations with morning rush hour § Class 2: Stations with morning + evening rush hour § Class 3: Stations with evening rush hour

Dimension Pair: TDW-S Configuration: Trends: n n X-axis: stations on I 35 W South; Y-axis: day of week n f(x, y): Avg. volume over all stations for Jan-Mar 1997 Busiest segment of I-35 W South is b/w Downtown MPLS & I-62 Saturday has more traffic than Sunday Outliers – highway branch

TTDTDWS: Comparison of Traffic Video Configuration: Traffic volume on Jan 9 (Th) and 10 (F), 1997 Trends: § Evening rush hour starts earlier on Friday § Congested segments: I-35 W (downtown MPLS – I-62); I-94 (MPLS – St. Paul); I-494 (intersection I-35 W)

TTDTDWTMYS(Album) Configuration: Trends: § Outer: X-axis (month of year); Y-axis (highway) § Inner: X-axis (time of day); Y-axis (day of week) § Morning rush hour: I-94 East longer than I-35 W North § Evening rush hour: I-35 W North longer than I-94 East § Evening rush hour on I-94 East: Jan longer than Feb