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Zhao, Junqiao (author), Ledoux, H. (author), Stoter, J.E. (author), Feng, Tiantian (author)The Level-of-Detail (LOD) 2 building models defined in CityGML are used widely in three-dimensional (3D) city applications. Many of these applications demand valid solid-based geometry (closed 2-manifold), which is crucial for analytical and computational purposes. However, this condition is often violated in practice because of the way LOD2...journal article 2018