The spatiotemporal index for the constraint network is one of the key issues in this field.
受限网络中的时空索引是解决此类时空数据管理问题的关键所在。
On the basis of this model , the author put forward a R-tree based Composite Spatiotemporal Index (CST-TREE) and described its structure and mechanism.
并在此模型上提出了一个基于R树的复合时空索引（CST-TREE）机制，定义了节点结构，并分析、描述了此索引的结构及原理。
Urban air quality level is token by air quality index (API), whose spatiotemporal change can reflect the change of urban air quality.
城市空气质量水平是以空气质量指数(API)来表征的，API的时空变化可以反映城市空气质量的变化过程。
The spatiotemporal change characteristics of land use of Pingdu County during 1990~2004 have been researched by some models and index.
利用多种模型与指数分析了平度市1990～2004年土地利用的时空演变特征。
The spatiotemporal change characteristics of land use of Pingdu County during 1990~2004 have been researched by some models and index.
利用多种模型与指数分析了平度市1990～2004年土地利用的时空演变特征。
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