VISUALIZATION OF BUILDING MODELS AND FACTUAL DATA INTEGRATED BY CITYGML
Technical University of Munich,Department of Cartography, Munich, Germany
Today, thermal infrared (IR) images are used for many different applications. Satellite images are used for fire detection, vegetation monitoring or the analysis of urban heat islands. Airborne IR-systems are applied for traffic monitoring or detection of leakages in district heating systems. Terrestrial cameras are used for recording the radiation of building facades, for the specification of its thermal behaviour. Topic of our research project is the enrichment and multi-purpose visualization of building models with emphasis on thermal infrared data.
Focus of this paper lies on the enrichment of 3D models with features extracted from IR images and on the integration of factual data, multiple image textures, and meta data into a GIS database. In the last year CityGML was developed to capture geometric data and links to textures images as well as factual data and meta data of 3D city models. Multiple textures given by, e.g. different sensors (visual and IR) or taken at different time to record the thermal behaviour of a building, can not be considered in CityGML. But, due to the open source individual extensions can be easily integrated. These extensions can not be displayed by standard 3D viewer like LandExplorer. Open source viewer like Aristoteles has to be adapted to explore the scene and to visualize these different features and data.
This paper describes the procedure to convert and editing all in the project included data formats like X3D, VRML, ASCII or TIFF Files into CityGML. The challenge is to get a reference between the gained IR-images and their informations to the existing building data. Furthermore, Aristoteles have to be modified with a special plugin to interpret and display all enriched IR informations of the CityGML File.