| In recent years,under the promotion and guidance of smart city construction,various industries have increasingly deepened the demand for informatization construction relying on 3D visualization scenes.As the most important feature data in real 3D scenes,3D building models have been widely used in various fields.At present,with the support of oblique photogrammetry,3D laser scanning and other technologies,the research on the integrated visualization application and spatial pattern analysis of large-scale 3D building models has become mature.It is more urgent for various industries to perform fine-grained role division for 3D building visualization management on the basis of existing precision model data,and fully mine the implicit information data of each 3D building role object.In this way,it can have the ability of monomer visualization,management,query and calculation combined with GIS,realizes multi-level and all-round display of 3D building models,and assists decision-making analysis,so as to meet the needs of scenes with different granularity.At the same time,with the application of 3D building models continuously expands in breadth and depth,it has become an inevitable problem to effectively manage the model information data and ensure the safety and stability of the model data.Especially with the rapid development of the Internet,traditional GIS continues to expand and extend to 3D Web GIS,and the security problems of information such as secret related 3D models on the web are becoming increasingly prominent.It has become an urgent problem to realize the hierarchical configuration of role permissions and information access control of integrated 3D building management in multi-user and multi-granularity3 D visualization scenes.In view of the above problems that the granularity requirements for 3D building management do not match the granularity of model operation access,and multi-granularity information management for 3D buildings,this thesis studies the role permission design and application of 3D building visual management.The main work is as follows:(1)Based on the fine-grained operation and access requirements of 3D building model,combined with the analysis of building geometry,semantic information and practical application scenarios,this thesis divides 3D buildings into "building-layer-household" hierarchical roles with spatial inclusion relationship.This thesis constructs a 3D visualization scene through Cesium,adopts the dynamic monomerization method based on Primitive,and realizes the single visualization expression for different building roles by means of height stretching,color rendering and attribute display.(2)This thesis proposes a role permission control model integrating 3D building management.Based on the traditional RBAC model,the model combines the characteristics of 3D building management and adds spatial constraints and time constraints,which simplifies the establishment of logical relationship between users and building roles at all levels,and improves the flexibility and diversity of model authorization.(3)This thesis designs and implements a 3D visualization management platform that integrates building role permissions.Based on the 3D visualization scene,it verifies the feasibility of the role visualization expression method for 3D building management and the role permission control model that integrates building management,and realizes the hierarchical configuration of role permissions and information data access management of integrated building management in multi-user scene.It provides research ideas for 3D building information data management in multi-granularity scenes. |
