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在以往水土流失应用系统中,查询分析主要建立在二维地理信息系统的基础上。主要研究在三维数据模型基础上实现查询,利用层次细节水平(LOD)方法以及海量数据动态调度方法解决海量数据的提取、调度,以ArcSDE作为空间数据引擎来管理和高效访问空间数据,通过GIS组件实现三维数据的可视化。以此应用到湖北省水土保持综合查询系统中,结果表明系统能在三维模型基础上有效地对全省水土流失相关信息的查询统计。
In the past soil and water loss application system, query analysis is mainly based on two-dimensional geographic information system. The main research is based on the three-dimensional data model to achieve the query, the use of level of detail level (LOD) method and mass data dynamic scheduling method to solve the massive data extraction, scheduling, ArcSDE as a spatial data engine to manage and efficiently access spatial data through GIS components Realize the visualization of 3D data. The results show that the system can efficiently inquire the statistics of soil erosion information of the whole province based on the three-dimensional model.