Geoscience Reference
In-Depth Information
Towards Automatic Validation and Healing
of CityGML Models for Geometric
and Semantic Consistency
Nazmul Alam, Detlev Wagner, Mark Wewetzer, Julius von Falkenhausen,
Volker Coors and Margitta Pries
Abstract
The number of potential and existing application domains for 3D city
models has increased during recent years. As the quality of city models varies,
many data sets are not suitable for certain applications. The mere compliance with
existing standards such as CityGML is not sufficient. A definition of data quality
in a domain-specific context is necessary to validate data sets and to avoid erro-
neous results in down-stream applications. Although the workflow for 3D city
models is well-established from data acquisition to processing, analysis and visu-
alization, quality management is not yet a standard during this workflow. We show
that this problem persists even if data are standard compliant. Validation results of
real-world city models are presented to demonstrate the potential of the approach.
A tool to repair the errors detected during the validation process is under develop-
ment; first results are presented and discussed. The goal is to heal defects of the
models automatically and export a corrected CityGML model.
Keywords
Healing • Validation • 3D city model • CityGML • Repair
