The Three-Dimensional Reconstruction Of City Landscape And Visualization Representation

The information technology that based on computer science has greatly changed the life style of human in the 21st century .The concept of digital city comes from digital earth and digital city is an important component of digital earth. At the same time digital city is the necessary trend of information technology , undoubtedly the reconstruction of city landscape is the primary step and important content of digital city .The reconstruction of city landscape realized by the three-dimensional GIS based on 3S(GPS, GIS, RS) technology can widely used in many fields such as the management of national soil resource , urban planning .police department ,power and telecommunication department , forestry resourcemanagement etc.According to the related project, the paper focus on the study of the followings:1. The three-dimensional abstract of city landscape. Summarize current representation method (data model) of three-dimensional city landscape model. Expound the representation content and representation criterion of three-dimensional city landscape model.2. The theory and method of reconstruction of city landscape .It is classified into two parts the terrain modeling and the building modeling. Summarize the basic concept and theory of DEM and mainly introduce the method of creating TIN and GRID in the first part. Bring forward the concept of solid subdivide of the building in the second part .Building can be divided into three parts: the main body, the character, and the subordinate. Bring forward the method of use three-dimensional modeling software to establ ish c i ty landscape Lab which can finish the ci ty model i ng . The method can build the complicated building, realize the reuse of the model, save cost and improve the efficiency.3. Visualization technology based on OpenGL. Expound the basicprinciple and method of three-dimensional computer graphic and OpenGL . Use VC++6. 0 and OpenGL to realize the visualization of city landscape.The representation content, representation criterion of city landscape model and the establishment of city landscape model lab are applied in the "Digital Weihai Three-Dimensional Geographical Space Basic Framework" project .The practice prove that the methods bring forward in this paper can-improve the efficiency, save the cost and greatly accelerate the process of reconstruction of city landscape. Using VC++6. 0 and OpenGL can finish the realistic display of three-dimensional model and realize the visualization of city landscape.