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Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference

Geographic Information Systems (GIS). For STDs:GeocodingAddress correctionMorbidity assignmentMappingRoutine SurveillanceTrend analysisCase visualizationRapid response/OutbreaksSpatial analysis / research applications. Practical Tools. CentrusGeoStan ArcView StreetMapMapPointGeoCoder

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Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference

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    1. Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference

    2. Geographic Information Systems (GIS) For STDs: Geocoding Address correction Morbidity assignment Mapping Routine Surveillance Trend analysis Case visualization Rapid response/Outbreaks Spatial analysis / research applications

    3. Practical Tools Centrus GeoStan ArcView StreetMap MapPoint GeoCoder MapInfo MapMarker

    4. 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 An address is separated by its components: house/apartment number pre/post-directional street name city Zip code An attempt is made to find a "close" match in the source data. Addresses must have at least a street name, and either a city and state, or zip code in order for it to be processed.An address is separated by its components: house/apartment number pre/post-directional street name city Zip code An attempt is made to find a "close" match in the source data. Addresses must have at least a street name, and either a city and state, or zip code in order for it to be processed.

    5. Input File saved as a text file from Excel

    8. Mapping Geocoded Addresses

    10. Correcting Morbidity Assignments

    11. 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. Richmond National Ranking (Rates per 100,000)

    15. Strategic Surveillance Monitoring

    16. 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

    17. What is Normal for Week 2 of 2004?

    20. 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

    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. 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. Jeff Stover Director of Statistics & Data Management Email: jeff.stover@vdh.virginia.gov Phone: 804-864-7961

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