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Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004.

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Presentation on theme: "Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004."— Presentation transcript:

1 Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004

2 Division of HIV/STD G eographic I nformation S ystems (GIS) For STDs: Geocoding Address correction Morbidity assignment Mapping Routine Surveillance Trend analysis Case visualization Rapid response/Outbreaks Spatial analysis / research applications

3 Division of HIV/STD Practical Tools Centrus GeoStan ArcView StreetMap MapPoint GeoCoder MapInfo MapMarker ArcView ArcMap StreetMap ArcPublisher MapInfo Maptitude Geocoding Mapping PC Specifications: 40GB HD, 1024MB RAM, 3.2GHz Processor, monitor resolution, video card

4 Division of HIV/STD Geocoding matching an address to latitudinal & longitudinal coordinates Example: Address: 920 W Grace St Richmond, VA 23220 Latitude: 37.550164 Longitude: -77.451723 Input addresses are matched against a postal or geocoding database

5 Division of HIV/STD Input File saved as a text file from Excel NameStreetCityCountyStZip A Movable Feast1318 E Cary StRichmondRichmond CityVA23219 Azalea Food Market & Deli211 Azalea Ave.RichmondRichmond CityVA23227 Blimpie13969 Raised AnterMidlothianRichmond CityVA23112 Bogey's Bagels13520 Midlothian TrnpkMidlothianRichmond CityVA23113 Boychiks Deli4024-B Cox RdRichmondRichmond CityVA23233 Café 16021602 Rolling Hill DrRichmondRichmond CityVA23229 Carla's Kitchen920 W Grace StRichmondRichmond CityVA23220

6 Division of HIV/STD

7 NameStreetCityCountyStZip A Movable Feast1318 E Cary StRichmondRichmond CityVA23219 Azalea Food Market & Deli211 Azalea Ave.RichmondRichmond CityVA23227 Blimpie13969 Raised AnterMidlothianRichmond CityVA23112 Bogey's Bagels13520 Midlothian TrnpkMidlothianRichmond CityVA23113 Boychiks Deli4024-B Cox RdRichmondRichmond CityVA23233 Café 16021602 Rolling Hill DrRichmondRichmond CityVA23229 Carla's Kitchen920 W Grace StRichmondRichmond CityVA23220 Street_newCity_newStZip_newLongitudeLatitudeCensus BlockFIPSCounty_newCode 1318 E CARY STRICHMONDVA23219-4155-77.43288937.534887 51760030500 109551760RICHMOND CITYS80 AS0 211 AZALEA AVERICHMONDVA23227-3621-77.42435137.602463 51087200804 300051087HENRICOS80 AS0 13969 RAISED ANTLER CIRMIDLOTHIANVA23112-2005-77.66385337.402642 51041101006 102451041CHESTERFIELDS80 AS0 13520 MIDLOTHIAN TPKEMIDLOTHIANVA23113-4214-77.64945037.503059 51041100915 101651041CHESTERFIELDS80 AS0 4024-B COX RDRICHMONDVA23233-77.61970037.6244005108720011551087HENRICOE022ZC5X 1602 ROLLING HILLS DRRICHMONDVA23229-5012-77.54688537.601315 51087200104 302251087HENRICOS80 AS0 920 W GRACE STRICHMONDVA23220-4125-77.45172337.550164 51760040300 100351760RICHMOND CITYS80 AS0

8 Division of HIV/STD Mapping Geocoded Addresses Save the geocoded data as a.dbf file Save the geocoded data as a.dbf file Create a new map file in mapping software Create a new map file in mapping software

9 Division of HIV/STD

10 Correcting Morbidity Assignments

11 Division of HIV/STD Virginia Morbidity Corrections CY2002 2,404 total cases reassigned (46.2/wk) Richmond: -703 Henrico County: +510 Chesterfield County: +220 CY2003 2,547 total cases reassigned (50.9/wk) Richmond: -749 Henrico County: +528 Chesterfield County: +220

12 Division of HIV/STD Richmond National Ranking (Rates per 100,000) GONORRHEA - Richmond YEARRANKRATE*# OF CASES 199211805.93667 19936991.42029 199421280.72621 199521195.82371 19963876.01737 19977739.41466 19985793.71527 19992940.91827 20001923.61752 200111066.32109 20022 761.91507 20021912.11806 CHLAMYDIA – Richmond YEARRANKRATE*# OF CASES 1992NOT AVAILABLE 1993NOT AVAILABLE 1994NOT AVAILABLE 1995NOT AVAILABLE 1996NOT AVAILABLE 199711100.02181 19984841.51619 199911015.61972 200011175.52230 200111052.62082 200221065.82108 200211273.72522

13 Division of HIV/STD Gonorrhea cases and incidence rate per 100,000 for Washington State 1993 through 2002.

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15 Strategic Surveillance Monitoring

16 Division of HIV/STD Benefits Standardizes surveillance monitoring: “What is normal for a given week?” Uses data from 5 yrs. vs. 1 yr. Frequency distributions Easy-to-read map Adjusts according to disease Limitations Computations more complex Higher sensitivity (too many targets?) Not an outbreak detection method Highlights

17 Division of HIV/STD What is Normal for Week 2 of 2004? Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk 4 2 2002 2003 Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk 4 2 Step 2: Historical Average of Week 2 = (10 + 6 + 5 +12 + 9 + 4)/6 = 7.6 Step 1: Apply 3-week averaging window Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk 4 2 Repeat (Week 3): Historical Average of Week 3 = (6 + 5 + 7 + 9 + 4 + 2)/6 = 5.5

18 Division of HIV/STD Average (Week 2) = 7.6 95%99% Wk 2 (2003) = 10 cases = No Targeting

19 Division of HIV/STD Oct. 19thOct. 13thOct. 5th 99% + 5 week averaging window A = 5A = 7 A = 6A = 10A = 12 99% + 3 week averaging window

20 Division of HIV/STD Confidentiality “a picture’s worth a thousand words” GIS is fairly new to STD surveillance Technology has outpaced confidentiality standards Is geocoded and/or mapped data easily identifiable? Use of rates, ranges, etc. Randomization of points, offsets Need to establish guidance for users and recipients Data sharing agreements

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27 Useful Resources GIS in Public Health www.atsdr.cdc.gov/gis Public Health GIS News and Information www.cdc.gov/nchs/about/otheract/gis/gis_publichealthinfo.htm Federal Geographic Data Committee http://fgdc.er.usgs.gov National Spatial Data Infrastructure www.mapmart.com http://gislounge.com/features/aa053100a.shtml Geocoding 101 Software applications www.GIS.com www.mapinfo.com www.geocode.com Tele Atlas

28 Division of HIV/STD Acknowledgements Kyle Bernstein Joshua Michaud Baltimore City Health Department Michael Samuel California Department of Health Services Susan Lau Chris Delcher Virginia Department of Health Mark Stenger Washington State Department of Health

29 Division of HIV/STD Jeff Stover Director of Statistics & Data Management Email: jeff.stover@vdh.virginia.govjeff.stover@vdh.virginia.gov Phone: 804-864-7961

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