Research On Key Technologies Of Digital Outcrop Web Application Based On Cesium

Field outcrop is the surface exposed part of rock mass,the most direct and real representation of underground reservoir,and an important research object for geologists.The3 D model of Digital Outcrop based on oblique photogrammetry technology can truly restore the original appearance of outcrop in the field,retain the real coordinates,texture and other information,and avoid the disadvantages of traditional outcrop investigation,such as high risk and being greatly affected by the terrain environment.At present,many scholars at home and abroad have carried out research on Digital Outcrop,and most of them are based on C / S architecture,which has the problems of long development cycle,difficult maintenance and update,and difficult user environment configuration.Web based B / S architecture technology can effectively solve these problems.But at present,most of the research on Web Digital Outcrop remains at the visualization level,lacking information extraction,analysis and application of Digital Outcrop model:(1)The automatic publishing and visualization technology of Digital Outcrop model based on web is designed.This paper studies and realizes the data upload service of GB level model based on Web,establishes the real-time file monitoring service and network model publishing service,automatically publishes each new model and constructs the file index database,and realizes the rapid visualization of GB level model by combining with the LOD level loading technology of cesium.(2)The key technology of secondary analysis based on location extraction information is studied.Based on cesium,the key technologies of interactive and non interactive location information extraction are realized,and the extracted information is analyzed twice.The key technologies of rock occurrence measurement at web end are realized,and the original spatial analysis function is optimized.(3)The storage model of 3D vector data is constructed.Aiming at the storage of point,line and surface 3D vector data,the efficiency of reading and rendering single vector data is improved by separating vector data from rendering data.The R-trees 2D spatial index method is improved,and the retrieval mechanism suitable for 3D vector data is constructed to optimize the single retrieval method of relational database.(4)The Digital Outcrop service platform is built to realize the online application of web upload,automatic release,visualization and information extraction of Local Digital Outcrop.