Despite the recognized advantages of the use of BIM in the field of architecture and engineering, the extension of this procedure to the architectural heritage is neither immediate nor critical.<br> The uniqueness and irregularity of historical architecture, on the one hand, and the great quantity of information necessary for the knowledge of architectural heritage, on the other, require appropriate reflections.<br> The aim of this paper is to define a general framework for the use of BIM procedures for architectural heritage.<br> The proposed methodology consists of three different Level of Development (LoD), depending on the characteristics of the building and the objectives of the study: a simplified model with a low geometric accuracy and a minimum quantity of information (LoD 200); a model nearer to the reality but, however, with a high deviation between virtual and real model (LoD 300); a detailed BIM model that reproduce as much as possible the geometric irregularities of the building and is enriched by the maximum quantity of information available (LoD 400).

The research group of L'Aquila University defined a procedure to create an architectonical Information System called SIArch-Univaq. This information system can be integrated with "Risk Map" Italian database. The SIArch-Univaq is based on importation of architectonical three-dimensional photorealistic models in GIS environment. 3D models are realised according to building constructive elements, derived by a critical architectonic surveying; the importation of models into GIS allows the interrogation of the constructive elements (i.e. beam, window, door, etc.): this favour the knowledge of the architectonical heritage, indispensable requirement to plan processes of restoration, maintenance and management.

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Abstract:The urban landscape of the city of L'Aquila has undergone profound changes because of the 2009 earthquake. In particular, there has been a gap between the tangible immanence of places, outcome of history that brought them to the present, and the dimension of the intangible as the intersection between memory and everyday life. In this context, applications of augmented reality offer themselves as an instrument of intersection between history and memory. Augmented reality becomes a complex storytelling tool, where the balance between the authoritative aspect of history and the participative re-meaning of urban sites can be summarized.