In this paper we developed an approach to 3D modeling of complex architecture such as medieval castles using multiple types of data. The method creates independent models from each type then assembles and integrates them to form one complete model of the site. The advantage of this technique is the flexibility it provides to handle complex and difficult-to-access sites where a single technique is largely inadequate. Two main research issues had to be addressed: (1) since image-based modeling will be required in most parts, the level of automation must be increased without compromising accuracy and robustness, (2) the seamless and accurate integration of models created independently from different sets of data of different accuracy and levels of detail. We provide new contributions to each of these areas and apply them to modeling the Stenico castle in the Trentino province, Italy. 1
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