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The ecosystem provides access to highly detailed, semantic 3D city models used in urban planning, environmental simulation, and digital twin development . As an international standard by the Open Geospatial Consortium (OGC) , CityGML files allow users to exchange complex 3D geospatial data that includes not just geometry, but also thematic properties and relationships between objects. Top Sources for CityGML Data Downloads

Accessing CityGML data is typically done through government open data portals or academic repositories. CityGML Standard – 3D Urban Data Model & Exchange Format citygml download