ArcSDE多图素图层快速渲染数据优化技术

Rapid Rendering Data Optimization Technology for Multi-feature ArcSDE Layers

针对ArcSDE多图素图层刷新渲染速度较慢现状,提出了图层数据的预处理与优化技术,涉及的关键环节包括:合并要素类、预生成注记图层、图层抽稀和预统一图层坐标投影等策略,并在各种比例尺下对优化策略与系统响应时间之间关系进行了测试与验证。最后结合某飞行体监控系统项目开发实践,证明了该技术在加快ArcSDE多图素图层刷新渲染速度上具有一定的可行性和实用性。

The data preprocessing and optimizing technique needs to be highlighted in order to accelerate the users′visual experience during the GIS interactive operation,especially when multi-featured ArcSDE layers are to be rendered.Considering time and space consumption,this paper addresses the data preprocessing and optimizing techniques,including feature grouping,annotation pre-creating,data generalization for scale-dependent drawing and projection pre-transformation for different layers.The relationship between the response time and above strategies is verified in detail under a series of different map scales. In the end of the paper, an example of flight body monitoring system is presented to illustrate the approach and the feasibility and practicability of the technique, and the result shows that the drawing performace is obvious enhanced by using above data preparation techniques and strategies.