Then the temporal and spatial characteristics of population density change were analyzed based on GIS.
在人口密度模拟的基础上，用GIS对上海人口格网数据进行简要的空间分析。
On spatial, there are high pollutants concentrations in active economic areas with high density of population.
空间上，经济活跃、人口密集点污染物浓度高。
Foundation pits generally gather at the field with large population and construction density and small spatial scale.
基坑工程一般集中在城市人口密集、建筑密度大的狭小场地。
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