Based on comparative analysis on spatial temporal distribution characteristics of soil nutrients of typical dam land in Beigou small watershed of Yan 'an City.
通过对延安市北沟小流域典型坝地土壤养分的测定，分析比较了其土壤养分时空分布特征。
The temporal and spatial distribution of traffic accidents and main influencing factors are found through analysis of road traffic accidents based on GIS technology.
通过GIS技术进行道路交通事故的时空分布分析，发现其在空间和时间上的分布规律及其主要影响因素。
The method to identify the primary congestion was proposed based on an analysis of characteristics of the spatial-temporal distribution of congestions.
在分析拥堵的时空分布特征基础上，提出了原发性拥堵的判别方法。
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