Comparison between two OGC standards for indoor space: CityGML and IndoorGML

Recently two standards - OGC CityGML [1] and OGC IndoorGML [2] - have been developed by the Open Geospatial Consortium(OGC) [3] for the interoperability between services and reusability of indoor maps. Although CityGML and IndoorGML provide frameworks of standard data models for indoor spaces, the goals and approaches of these standards are different and they can be used in a complementary way. This paper therefore aims to study their strengths and weakness, clarify which standard to be used for different types of applications, and explain how to integrate them to make useful applications. This work is based on the experiments of two real sites in Seoul; a shopping mall at Lotte World Mall and a subway station in Seoul. The comparative study is conducted from the representation and application viewpoints respectively.