A Study On The 3D_Visualization Of City Buildings

Geo-Visualization is one of the hotspot issues of GIS and Cartology. Basing on this background, this dissertation focuses on the study of 3D-Visualization of City Buildings which is the applying area of 3D-Visualization in Geography.After analyzing and evaluating the disadvantages, merits and applying spectrum of different 3D data models ,this dissertation makes use of one of the facialmodels-MultiPatch to achieve 3D visualization of city buildings. At the same timethis dissertation also analyses and has a study of the series key technologies in the processing of doing 3D visualization of city buildings. On the base of study of the series crucial technologies the main works this dissertation has achieved are as follows: Applying ESRI's COM object library -ArcObject , this dissertation has developed two modules which have enhanced the modeling and displaying abilities of 3D city buildings in ArcScene environment and Applying the OpenGL library this dissertation has developed a 3D city building displaying software with own property right.There are five chapters all together in the thesis. The first chapter is preface, which introduces the problem the thesis will solve, gives the answer for the question why the thesis will study this topic and reviews the current development of 3D visualization and also illustrates briefly the aim and methodology of this systematic research. The second chapter demonstrates the crucial problems and technologies the thesis must solve during the implement of 3D visualization. Those crucial technologies are the building modeling technology of city buildings, the conversion technology from 2D data to 3D data, the displaying technology of 3D data and the enhancing technology of 3D displaying. The third chapter focuses on the first methodology of doing 3D visualization with city buildings: Making use of the commerce 3D GIS software to do the 3D visualization with city buildings. Applying ESRI's COM object library -ArcObject, this dissertation has developed two moduleswhich have enhanced the modeling and displaying ability of 3D city buildings in ArcScene environment. The main functions of those two modules are 3D roof modeling and multi-texture generating of city building. The forth chapter present the software developing of 3D visualization platform facing city building with OpenGL and introduces aims of software developing and plans, realizing mode of function modules and so on . In chapter five, the research results are concluded. Furthermore, future studies are discussed, too.