For tasks such as the generation of realistic visualizations from pedestrian viewpoints in virtual reality and multimedia applications, urban models extracted from airborne data are too coarse and therefore have to be refined. Within the paper, terrestrial LIDAR data as well as facade imagery is used to increase the quality and amount of detail for the respective 3D building models. These models, typically available from airborne data collection, provide a-priori information, which can be integrated efficiently both for the georeferencing of the terrestrial data and the subsequent geometric and visual enhancement. We introduce two approaches to increase the geometric detail of facades. One approach is based on a planar mapping of point clouds, called LASERMAP, the other is based on cell decomposition.