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As Sri Lanka's cities expand rapidly, geospatial technology is proving essential for sustainable urban development. Modern infrastructure planning relies on comprehensive GIS analysis to make informed decisions about transportation networks, utility placement, and disaster preparedness. High-accuracy surveying techniques ensure roads and railways are constructed with precise alignment, reducing costs and environmental impact. Digital elevation models help engineers design effective drainage systems that prevent urban flooding during monsoon seasons. 3D city modeling enables visualization of proposed developments, helping planners assess visual impact and optimize building placement. Geospatial analysis of population density, traffic patterns, and service accessibility guides the creation of efficient public transportation routes. Underground utility mapping prevents costly conflicts during construction projects. By integrating multiple data layers—from soil characteristics to seismic risk zones—urban planners can create resilient cities prepared for future challenges including climate change and population growth.