FEATURES OF HERITAGE BIM MODELING BASED ON LASER SCANNING DATA

Abstract. BIM modeling technologies are gradually becoming mandatory and necessary in a life cycle of a building or structure. The main difference between BIM and other types of design is the collection and comprehensive processing of all architectural, technological, economic, operational and other information about the building in a single informational environment. Moreover, all elements of the model are interconnected and interdependent, which ensures the maximum proximity of the model to the real situation. The advantages of BIM technology for cultural heritage sites are operational guidance and quality control of restoration and construction works, minimizing the probability of errors in projects, cost reduction and optimization at operation phase. Technological scheme of high-precision information modeling of cultural heritage objects includes data acquisition, modelling of structural elements and accumulation of attributive information in a specialized software environment, quality control, visualization. The data acquisition stage is based on analysis of existing data and documentation, executive surveys. For this purpose, terrestrial laser scanning is a perfect surveying tool due to its speed, accuracy, completeness of data and level of detail. The difficulty of determining the technical characteristics of the elements and their physical properties, can be partially solved with excessive information provided from laser scanning, and the complexity of modeling deformations and deviations, restricts the level of development and detail (LOD) of the BIM model but define use of mixed LOD (LOD200-500) for a cultural heritage object. The factors that determine the LOD of BIM modeling are: the current state of the object, surveying accessibility, availability of documentation etc. Considering such modeling features provides the creation of a informational model that determines the functionality of the object, in respect with its cultural, historical and architectural value.