Research On The Construction Of Digital Resources For Individual Architectural Heritage Based On Multi-source Data

In the era of big data,cultural heritage conservation has gone from digitalization to datafication and now tends to be intelligent.Facing the urgent demand of architectural heritage conservation and revitalization utilization of national system and the requirement of building digital resources of architectural heritage in the era of big data,how to achieve higher precision and high efficiency in building digital resources of architectural heritage is the key issue in this field.To address the three main problems in the current situation of digital conservation research of architectural heritage: incomplete data types,insufficient accuracy,insufficient systematic methods for constructing high-precision and high-efficiency models for different needs,and insufficient correlation between geometric and non-geometric heritage data to form a complete data resource system,this study uses classification and grading methods for multi-source data,3D model reconstruction based on 3D laser scanning technology and tilt photography Through the in-depth research on the classification and grading method of multi-source data,3D model reconstruction technology based on 3D laser scanning technology and tilt photography measurement,and the technical process of HBIM,this study proposes to construct a 3D realistic model based on the fusion of multi-source data with the help of software system,and then construct a digital resource of single building heritage through HBIM:(1)The concept and types of multi-source data of architectural heritage are summarized through literature reading and field research,and based on the demand analysis of cultural heritage big data,the grouping classification method is adopted to propose a "knowledge outline-sub-facet-sub-facet-class" oriented system composed of "knowledge outline-sub-facet-class" from two dimensions of architectural heritage domain characteristics and data characteristics.The classification system of digital resources of architectural heritage is composed of "knowledge outline-sub-face-subface",which is oriented to the needs of intelligent big data.(2)In-depth research on the digital resource accuracy requirements of architectural heritage digital resources in different application scenarios,combined with the Guangdong Provincial Standard for Digitalization of Historic Buildings and the multi-LOD spatial information standard of BIM model,and graded digital resources in terms of non-3D spatial information completeness and 3D spatial information,proposed a set of architectural heritage data accuracy grading system applicable to different application requirements,and solved the problem of The problem of insufficient efficiency of modeling methods for different needs is solved.(3)The types and acquisition methods of multi-source data of architectural heritage are sorted out,and the advantages and disadvantages of 3D model reconstruction methods based on laser point cloud scanning and photogrammetry are compared,and the steps involved in these two technologies and the related technologies involved in each step are explored in depth,and for the research gap of indoor photogrammetry,two methods of equal baseline shooting and fixed-point surround shooting are proposed and compared through experimental tests.Finally,we propose a 3D real-world model construction method based on the fusion of laser point cloud and indoor and outdoor multi-view image data.Through the study of the process of HBIM,the construction of the family and non-geometric information linking way to explore the proposed HBIM-based refinement of digital resources construction method.(4)Through the example research and mapping of the cultural relics protection unit Wu Xian Gong in Guangdong Province and data processing and modeling,the proposed digital resource construction method based on multi-source data for a single architectural heritage is validated,and the digital resources of Wu Xian Gong are constructed to provide data support for its subsequent restoration and conservation use,and the application areas of digital resource construction for architectural heritage are also explored.