Which statement about GIS in environmental health practice is true?

• A. GIS is used only for map making and cannot support planning
• B. GIS cannot integrate with emergency operations data
• C. GIS is limited to static datasets
• D. GIS maps spatial data and supports exposure assessment, hazard mapping, resource allocation, and disaster planning

Answer: (D)

Geographic information systems unite maps with data layers to support decision making in environmental health. A true statement is that GIS maps spatial data and supports exposure assessment, hazard mapping, resource allocation, and disaster planning. In practice, GIS lets you overlay where people live with where pollutants occur, so you can estimate how many people are exposed and characterize risk. It helps identify hazards by mapping flood zones, contaminant sources, heat islands, and other risk factors, guiding targeted interventions. For resources, GIS shows clinics, shelters, water sources, and helps optimize where to send supplies during emergencies. For planning, it supports evacuation modeling, route optimization, and scenario planning by integrating data from health, environment, and emergency management. Importantly, GIS is not limited to static maps; it can incorporate real-time data feeds and emergency operations data to support timely decisions, and its analytical capabilities go beyond simple mapping to enable spatial queries, overlays, and modeling that inform planning and response.