Changes in the Spatial Distribution of Ozone in Texas from Weekdays to Weekends

1. Changes in the Spatial Distribution of Ozone in Texas fromWeekdays to Weekends Gookyoung Heo Environmental & Water Resources Engineering Program, Department of Civil Engineering, University of Texas at Austin

2. Air Quality & GIS • Complex and Comprehensive Data • Frequent relocation of monitoring stations • Frequent irregular short-term or long-term missing data • Spatial Distribution (Characteristics of Air Pollution) • This Study: Weekday-Weekend Differences of Ozone Distribution (With Application of Arc Hydro)

3. DATA • EPA-AIRS (Big Raw Data Files: X00 MB) • TNRIS • Texas State, Counties (Shape files) • Time Series Data (Processed) *ArcGIS, ArcHydro-Compatible Format • Spatial and Temporal Data (Location, Time)

4. Extracting from the Raw Data

5. TSDateTime • Julian Day, Specific Format (MM/DD/YYYY HH:mm:ss): DateTime • EX) August 1, 1998, 8 AM.  08/01/1998 08:00:00 • Make Data in This Format (How?)

6. TSDateTime • Julian Day, Specific Format (MM/DD/YYYY HH:mm:ss): DateTime • EX) August 1, 1998, 8 AM.  08/01/1998 08:00:00 • Make Data in This Format (How?)

7. TSType (Day of Week) • TSType (ID for the subgroups) • Weekdays, Weekends (SUN, SAT)

8. TSType (Day of Week) • TSType (ID for the subgroups) • Weekdays, Weekends (SUN, SAT) Year, Month, Day, Hour Julian Day from a Starting Day Day of Week (Accumulated Julian Day/7) : If the starting day is Monday, MOD (Accumulated Julian Day, 7)= ? MOD(Monday, 7) =1 MOD(Sunday, 7) =0 TSType (Day of Week)

9. TSType (Day of Week)

10. Adding the Time Series Data and Monitoring Station Data

11. Get the Spatial Information Joining

12. Displaying the Joined Data

13. Future Work • Removing Flaws in the Prepared Data • Spatial and Temporal Analysis of Ozone Data of Texas during the Peak Ozone Months (Summer) • Spatial Interpolation (If appropriate) • Weekday-Weekend Differences

14. Thank you! Comments!