Connectivity Analysis Method And System Implementation Of City Pipe 3DGIS

With the acceleration of the process of city development,underground network system that consists of urban pipe network plays an increasingly important role in people’s production and living,to strengthen the effective management of pipe network system is taken more seriously,especially the connectivity analysis function that based on 3D scene visualization will become the future development and research trend of the pipe network system in the future.Implementation of the urban pipe network 3DGIS includes the construction of the network modal and the research and realization of the connectivity analysis algorithm.Based on building a network model and urban pipe network three-dimensional modeling technology of 3DGIS,false node and flow problems in network are solved in the network logic model by the topology processing rules,and the amenities network model based on flow is generated.Network skeleton model is built based on pipe geometry model and texture model features,and then generates 3D symbol model of pipe network.2D and 3D auxiliary model generates combined with other auxiliary model data and texture characteristics,3Dmax entity modeling combines with SuperMap numeric modeling,the 3D visual of pipe network achieves.The index for network vector data service is created by means of SuperMap SDX+spatial index and the OnlyID field identification is built to traversal pipe network.The study of connectivity analysis algorithm uses network equipment network model and adjacency matrix,based on the breadth-first calendar calculation method,uses forward or reverse search to traversal all pipelines and valves based on flow of information of the network model until the traversal condition is performed.Then combined with the SuperMap iObjects.Net dynamic link library,calling Analyst、Data、Mapping、Realspace class library to realize pipe network basic、Connectivity analysis、Three dimensional analysis functions and so on,among them Pipe upstream and downstream tracking Common upstream and downstream functions are realized by Tracking analysis class.On the structure and layout of the system,2D map window and 3D scene window are bound,display range is controlled and the 3D linkage is realized,the fight control of 3D scene,3D Excavation measurement,3D analysis and other functions are realized by Realspace space service class of SuperMap to enhance visual effect of 2D network analysis.