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A steadily growing number of application fields for large 3D city models have emerged in recent years. Like in many other domains,data quality is recognized as a key factor for successful business. Quality management is mandatory in the production chainnowadays. Automated domain-specific tools are widely used for validation of business-critical data but still common standardsdefining correct geometric modeling are not precise enough to define a sound base for data validation of 3D city models. Althoughthe workflow for 3D city models is well-established from data acquisition to processing, analysis and visualization, qualitymanagement is not yet a standard during this workflow. Processing data sets with unclear specification leads to erroneous results andapplication defects. We show that this problem persists even if data are standard compliant. Validation results of real-world citymodels are presented to demonstrate the potential of the approach. A tool to repair the errors detected during the validation processis under development; first results are presented and discussed. The goal is to heal defects of the models automatically and export acorrected CityGML model

TOWARDS AUTOMATIC VALIDATION AND HEALING OF CITYGML MODELS FOR GEOMETRIC AND SEMANTIC CONSISTENCY