UDigiT-Doctor

The overall aim of the project is to transfer and extend existing methods for the validation and automated repair of 3D building models to urban digital twins, including the integration of planning data for more complex infrastructure projects.

The overall goal of UDigiT-Doctor is therefore to use existing methods for the validation and automated repair of 3D building models to UDTs including an integration of planning data of more complex infrastructure projects. For this purpose, the following main objectives are announced:

• Design of an internal data structure and elaboration of procedures for the generation of an integrated overall model.
• Verification of the topological relationship of objects to ensure basic properties of a generally usable base model and for selected application scenarios (control networks, connections, ...).
• Extension of the testing and repair process by comparison methods using reference models.
• Comprehensive and configurable semantics testing.

An UDT represents a highly complex dynamic system of systems. The quality management of logical and semantic consistency in the UDT should both take into account and utilize the fact that the same object can exist in different data sets in the UDT. For example, a building can be stored with floor plan accuracy in the official 3D building model and/or as a mesh model or point cloud without semantic information.  A BIM model can also represent the same building.  This applies analogously to other objects such as bridges and street furniture.   The various representations should be used as a reference in quality management.  This enables new validation methods for the integration of as-built and planning data (GIS-BIM integration) in order to recognize and, if necessary, resolve conflicts between the plan and existing data. At the same time, the multiple representation of an object in different models is to be used as a reference for automated model correction.  Based on the CityGML Quality ADE, a formal concept is being developed for this in order to define verifiable requirements for (topological) relations between neighboring objects in an application-specific manner and to link multiple representations of the same object.

The focus here is on detailed object representations in CityGML LoD 3 or high-resolution mesh models. In addition to correcting the object geometry, a comprehensive semantic check and the semantic enrichment of all models (e.g. supplementing mesh models with semantics from CityGML models) is also planned. The concepts will be evaluated in three case studies. The areas of ‘line connections’ (connection of bridges to road segments and bodies of water as well as grid-bound infrastructure, i.e. house connections, water supply and disposal), ‘landscape planning’ and a case study on the ‘integration of model data’ are planned. case study on the ‘integration of model data’, including the semantic enrichment of model data. model data, with a particular focus on the issue of GIS - BIM integration.

• Concept for the quality management of urban digital twins
• Open source software for the validation of urban digital twins, which supports the developed concept for quality management.