GIS-Based Underground Pipe Network Visualization Research

Underground pipeline is a kind of important basic establishment of modern production and living, it takes on some important basic work, such as information and energy transmission. Making use of the technology of geographic information system, we can manage urban underground pipeline network and store pipeline information into computer orderly in order to update data and share resource. Digital underground pipeline information takes off traditional management limitation and plays an important role in constituting feasible, technology advanced and economic rational scheme of city planning, designing and management.Because pipelines distribute underground, planar graph can not express the distribution intuitively. Through figure map only, we can't realize spatial disposal of underground pipeline up and down. So when we process construction and maintain pipline, some accident happens. It brings great economical loss to our country. So we use three dimention map to resolve the problem.Firsrly this paper discussed the conception and application of underground pipeline information system. Then it brings out pipeline visualization and its application significance. Secondly, it also discusses the key technology of underground pipeline management system's development: COM GIS, spatial data management mechanism based on MapX and OpenGL work principle.Sencondly through analyzing the pipeline data traits and the space topological relation of the pipe data, it establishs three dimention data model and data structure. This paper maily solves the pipeline three dimention visualization using OpenGL and VC++, it including three part mainly: pipeline reconstruction of spatial data; the operation of three dimention graph including rotation control , translation control and zoom control; the smoothness management in the join of the pipelines; Acquisition of attribute dada using selection and feedback theory; describing the building and practical application of transect and vertical section particularly; introducing several blending pipe surfaces and finding a method to join the two pipe when two pipes' radius are different.