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The maps shown here depict the spread of measles through Prince William County in 1988 . <br /> The locations of the patients by home address show a random pattern , while the plot by <br /> school shows obvious aggregations of cases . When viewed by two-week periods , the spread <br /> of the illness from school to school becomes apparent. In fact, during the outbreak it was <br /> possible to document dating patterns and sporting events that facilitated this spread . One of <br /> the control measures was halting certain sporting events . <br /> Using additional GIS data layers , researchers can look for possible links to diseases by <br /> comparing disease clusters with extremely hazardous substance site ( EHS ) facilities and their <br /> vulnerability zones . In cases of illness for gastroenteritis , clusters can be viewed and possibly <br /> identified with restaurants and other commonly frequented establishments . <br /> By implementing this analytical process with GIS , epidemiologists can identify, locate, and <br /> group illnesses with people, places, and activities : develop a plan ; and initiate control <br /> measures to halt the spread of disease . This kind of process was used in handling the <br /> potential threat of the West Nile virus and the outbreak of human encephalitis , which began <br /> in New York City in early August 1999 . <br /> "Case Study Courtesy of ESR) Map Book Gallery Volume 16 <br /> iGIS Data Layer Inventory and Recommendations <br /> The Health Department will benefit from access to several other departmental GIS data <br /> layers . It is expected that once all departmental data is integrated , consolidated , and <br /> centrally stored , that staff will have access to all non-classified GIS data layers from other <br /> County departments . <br /> } Health Department personnel expressed that access to the following GIS data layers would <br /> be beneficial : <br /> Extract , cleanse , <br /> geocode , and map <br /> from address database ; Automated ; Community <br /> Address Points georeference based on Development/Planning Recommended <br /> aerial photography and <br /> GPS field work <br /> Hy-over with control Property Appraiser - GIS <br /> Aerial Photography Existing <br /> points and Mapping <br /> Extract, cleanse, <br /> Business Licenses geocode and map from Community Development Recommended <br /> CD- Plus database <br /> Extract, cleanse, Engineering <br /> geocode and map from <br /> Capital Projects Capital Projects Division /Surveying and Recommended <br /> database Mapping <br /> Census Data Acquire from Census Community Development Existing <br /> Bureau <br /> Code Enforcement Extract, cleanse , <br /> Data geocode and map from Automated Recommended <br /> CD-Plus database <br /> 215 <br /> GIS Needs Assessment and Implementation Plan Chapter 1 - Departmental GIS Needs Assessment <br />