Design a GIS-based decision support system for urban infrastructure planning.

System design: database architecture with spatial (roads, utilities, land parcels, buildings) and attribute data integrated from multiple sources. Data model in geodatabase with topology rules and relationship classes. Analysis modules: site suitability using weighted overlay, demand forecasting with demographic data, network analysis for optimal routing/facility location, impact assessment zones. Visualization: thematic maps, 3D city models, web-based dashboards. Integration with CAD for design workflows. Mobile data collection for field verification. Scenarios modeling for comparing alternatives. Metadata and data quality standards. User access controls and backup procedures. Training program for stakeholders.