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

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

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

Extracting from the Raw Data

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

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

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

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

Adding the Time Series Data and Monitoring Station Data

Get the Spatial Information Joining

Displaying the Joined Data

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

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