3D Visualization Of Geological Information Based On WebGL

With the rapid development of information science and technology, the network technique and computer graphics, information technology ha ve been widely used in various fields of social production. In modern time, informatization, digitization and networking ha ve become the significant means of promoting social development. The digital mine, reproducing the whole mine and relevant phenomenon, has gained more and more attention of mining industry. Geological 3D modeling theory and 3D visualization technology, as a part of digital mine, are of great significance to improve the construction and practical application of all kinds of projects.This thesis will combine WebGL technology and related construction methods of 3D geological model to realize 3D virtualization of geological information without any plug- ins. The main research contents are as follows:1) This thesis will analyze 3D modeling of geological body and the current development of WebGIS. Meanwhile the key technology and basic theory of visualization such as HTML5, JavaScript and WebGL will be studied.2) The geological database will be established in the MySQ L database after analyzing the data model and data structure of drilling, stratum, and tunnel.3) In this paper, the trace of drilling holes will be smoothed with Catmull-Rom interpolation algorithm. And the stratum model will be constructed with TIN, convex hull and adjacent outline sync. Then the cross-cut model of tunnel and stratum will be fitted by generating CD-TINs.4) An experiment system will be developed with the use of HTML5 and WebGL technology to conduct a 3D visualization verification of drilling model, stratum model, tunnel model and the cross-cut model of tunnel and stratum.By making 3D visualization experiments with geological body model with HTML5 and WebGL technology, this thesis finds that the application of WebGL technology enables the model of geologic bodies to render in the browser directly without the assistance of any plug- ins. The 3D display effect is superior and it will provide reference to the development of 3DGIS system.