基于CityGML的三维GIS理论方法与实践探究
[Abstract]:Geographic Information system (information) is one of the most important technologies in urban informatization, which mainly realizes the informatization of urban space. The traditional two-dimensional GIS can solve the plane symbolization of the city, but it can not give people the real feeling of the city. The realistic city is three-dimensional in physics, so the spatial information describing the city should also be three-dimensional continuous, the plane symbolic projection of two-dimensional GIS can not meet the reappearance of three-dimensional city, 3D GIS makes up for this defect. However, the early 3D GIS model only seeks to display geometric shape and appearance, but lacks the representation of semantic attributes and topological structure of the model. And many 3D software manufacturers have established their own independent 3D format, lack of unified modeling standards, which greatly affect the global universality and sharing of 3D urban models. In order to solve these problems, OGC (Open Geography Spatial Consortium) issued a standard of 3D city modeling CityGML (City Geography markup language). Compared with other modeling languages, CityGML pays more attention to the representation of the model at the semantic attribute level, which satisfies people's desire to understand and apply the internal structure and intrinsic attributes of geographical objects. CityGML is based on the common modeling standard. It also provides a guarantee for the sharing of 3D models in the world. Based on the summary of current CityGML research, this paper synthetically studies a series of CityGML application links, such as the acquisition, simplification, mapping into the database and visualization under the three-dimensional network services of CityGML model data. Taking the 3D virtual campus of Chongqing normal University as an example, the 3D scene of campus is established with CityGML data, and the 3D network service of the scene is published and visualized. The main innovation of the research is: a. From the point of view of the whole process of CityGML application, this paper studies the data acquisition, storage and storage, network sharing and visualization of CityGML. The study of the whole flow angle is beneficial to the feasibility and coordination in the practical application of CityGML, and has a strong practical guidance function. Several methods of obtaining CityGML model are analyzed and compared. In view of the fact that the data source of many domestic studies is the instance data of CityGML official website, this paper compares and studies several methods of obtaining CityGML data in foreign countries. Based on the analysis of the object-oriented nature of CityGML, the structure of CityGML database is designed, and a visual import and export tool is developed. It realizes the quick input and exit. D of CityGML, and realizes the sharing of CityGML based on 3D network service. Compared with the sharing mode based on Google Earth or CityGML file, the sharing mode based on W3DS can realize the sharing and interoperation of CityGML in browser.
【学位授予单位】:重庆师范大学
【学位级别】:硕士
【学位授予年份】:2013
【分类号】:P208
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