Web based hybrid volumetric visualisation of urban GIS data - Integration of 4D Temperature and Wind Fields with LoD-2 CityGML models J. Congote, A. Moreno, L. Kabongo, J.-L. Pérez, R. San-José and O. Ruiz Published online: 24 October 2012 DOI: 10.1051/3u3d/201203001