The City of Vienna plans to establish a free download of the generalized version of the 3D city model (LoD 2 by definition of SIG 3D). To improve the clarity, UVM Systems was commissioned with automatic texturing. In this case, the output data format CityGML had to be strictly reproduced in its predefined structure. The aerial photographs of the year 2015, which were also used for the automated creation of the 3D city model, were available as data bases. Thus, contradictions between the building models and the aerial texture could be excluded from the outset. Texturing was carried out between October and December 2016 using the "CityDB" CityGML database schema. In the course of this work, the existing city model went though a correction of geometrical and semantic deficits and was supplemented by information on adjacent facades. The knowledge about these "warm facades" (adjacent facades) is particularly valuable for energy supply simulations. The textured 3D city model is publicly provided by the City of Vienna in format CityGML.

• Camera system: Ultracam XP
  
• Date of recording: 2015
• Image type: nadir aerial images
• Average ground resolution: 10cm
• Coverage (nadir): 80% longitudinal / 60% transversal
• Number of buildings: 250.000
• Project area: 420 km²