County economic difference has spatial characteristic, because space is its inherent attribute.
空间是县域的固有属性，县域经济差异也就必然具有空间分异特征。
Considering spatial characteristic of data association, the nearest neighbor algorithm is investigated in detail.
考虑到空间数据关联的特点，作者对空间最近邻居定位算法进行了详细的研究。
Then a karstic model is built based on the analysis of the spatial characteristic, distributing rule and controlling factor of rock mass.
分析了坝区岩溶空间形态特征、岩溶空间分布规律以及岩溶发育的控制因素，建立了左岸岩体溶蚀模式。
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