Abstract
Recent progress on indoor positioning and mobile devices allows to provide indoor spatial information services such as indoor LBS or indoor disaster management. In order to realize these services, indoor maps are a crucial and expensive component of the system. For this reason, the interoperability among services and sharing indoor map and spatial information is a fundamental requirement of the indoor spatial information system. Several geospatial standards have been and being developed to meet this requirements, among which CityGML LoD 4 (Level of Detail 4) and IndoorGML are the most relevant ones for indoor spatial information. However the objectives and scope of these standards are different although their integration may give a synergy effect. In this paper, we discuss the issues on the integration of IndoorGML and CityGML LoD 4 and propose two methods: automatic derivation of IndoorGML data from CityGML LoD 4 data set and external references from IndoorGML instance to an object in CityGML data. The derivation and reference of external objects are based on the mapping relationship between feature types in CityGML and IndoorGML to be investigated in this paper. A simple prototype will be also presented, which has been developed to validate our methods.
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