Petra Schneidhofer¹, Christer Tonning¹, Erich Nau², Terje Gansum¹, Knut Paasche² and Wolfgang Neubauer³, (1)Vestfold County Council, Tønsberg, Norway, (2)Norwegian Institute for Cultural Heritage Research, Oslo, Norway, (3)Ludwig Boltzmann Institute for Archaeological Prospection and Virtual Archaeology, Vienna, Austria