基于道路格网的城市三维数据增量更新技术研究

传统空间数据库全覆盖式更新方法存在数据冗余及更新速率慢等问题,为了能够更好地支持海量城市三维数据的组织和更新工作,本文提出了一种基于道路格网的城市三维数据增量更新方法。利用城市道路格网分组、分块的特性进行城市三维数据的空间划分,建立城市格网模型,以不规则格网的形式进行城市三维数据的组织。利用城市格网模型划分的城市地理块具有不同功能属性的特点,以地理块的形式进行"时间+空间"的增量数据组织。可对城市三维数据进行时间方向和空间方向的历史回溯,改变了传统增量更新的查询管理方式。最后本文基于多基态修正模型设计了增量数据存储模型并给出了更新流程。以某市为例,开发了城市三维数据库增量更新原型系统,实现了城市三维数据的增量更新。

Research on the Urban 3D Data Incremental Updating Technology Based on Road Grid

The full coverage updating method of traditional spatial database has the problems of data redundancy and slow update rate. In order to better support the organization and update of massive urban 3D data, this paper proposes a method of urban 3D data updating based on road grid. The spatial division of urban 3D data is carried out by using the characteristics of urban grid grouping and block separation, and a urban grid model is established to organize the urban 3D data in the form of irregular grids. The urban geographical blocks divided by the urban grid model have the characteristics of different functional attributes, and the "time + space" incremental data organization is carried out in the form of geographical blocks. The time direction and spatial direction of urban 3D data can be tracked, and the traditional query management mode of incremental updating has been changed. Finally, based on the multiple-base state correction model, an incremental data storage model is designed and the updating process is given. Taking a city as an example, a prototype system of urban 3D database incremental updating is developed, and the incremental updating function of urban 3D data is realized.