Sustainable SDI for EU noise mapping in NRW- best practice for INSPIRE

The Environmental Noise Directive of the European Union 2002/49/EG (END) obligates the EU member states to determine every 5 years the noise emission of major roads and railways, major airports, industrial activity sites and urban agglomerations and to document the results in noise maps. It poses high requirements, as a great number of statewide and ubiquitous geodata and thematic data in the third dimension is necessary (terrain, buildings, roads, railways). To provide these considerable amount of statewide 3D geodata, the state of North Rhine-Westphalia (NRW) follows a modern implementation concept, the sustainable use and enlargement of the Spatial Data Infrastructure GDI NRW. NRW provides for the first time statewide 3D geodata as features in CityGML via OGC Web Feature Services (3D building models in LOD1, ATKIS 3D road and railway data) and the Digital Terrain Model 10m grid via an OGC Web Coverage Service. CityGML is used as sole common exchange format between web services and noise calculation software to solve syntactic and semantic interoperability problems. A CityGML data base is realised, which contains approx. 10 million buildings. This article demonstrates the architecture of geodata provision, the 3D modelling in CityGML, the geodata refinement and interoperability tasks as well as the noise calculation results.