3D Visualization Investigation In Water Conservancy Area

With the fast development of computer technology and the specialization trend of 3D GIS, it is necessary and realizable to building a visible, digital, informational and intelligentized system with the three-dimensional visualization foundation, only in which variable of data and information can be fed back to users in time, dynamic and straight.Based on lots of advanced results of computer graphics, modem mathematics, computer science and topography, etc. this thesis discussed the theory, techniques and arithmetic of three-dimensional visualization, such as the data structure based on three-dimensional space, terrain and object modeling techniques, basic theory of three-dimensional terrain visualization, dynamical three-dimensional terrain display, matching and display technology between terrain and objects and spatial query within three-dimensional terrain maps.At last, based on the researched result of the above problematic situation, the three-dimensional visualization system applied to water conservancy has been established combining with experience and practice in the item of "3D-Dynamic Simulation System (derivating the water from Changjiang to Taihu Lake)". Varity of data can be received and pretreatment, three-dimensional visualization and dynamical display of terrain, object display on terrain, and spatial analyses and query.This investigation has important theoretic and practical meaning. In theory, we investigate the data structure, designing terrain and matching technology about models in terrain. In practice, it is the basic of the global realization and 3D GIS introduction; it is the key to realize the 3D visualization map; it is important in the "digital conservancy", and provides a archetype system for the 3D visualization system in conservancy area.