空间数据分析和建模是地理信息系统的核心，DEM是空间数据的重要内容。
DEM takes an important part in spatial data analysis and modeling, which is the heart of GIS.
空间聚类是空间数据挖掘研究的重点内容之一，被广泛应用在空间数据分析中。
Spatial clustering is one of the important research topic in spatial data mining, it is widely applied in spatial analysis.
摘要本文通过探索性空间数据分析，发现中国省域知识产出和投入要素具有显著的空间集聚特征。
Abstract: Through exploratory spatial data analysis, the spatial agglomeration characteristics of outputs and inputs of Chinese provincial knowledge production are found.
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