Ni：指i区的平均人口密度，为了简化分析，地球表面被按照网格分成多个i区，每个区的分布假定是统一的。
Ni : Average population density in area i. To simplify the analysis, Earth’s surface is divided into a grid of squares i, and the distribution is assumed to be uniform in each.
提出了一种基于笔画密度的弹性网格特征提取方法。
An elastic meshing feature extraction method based on the stroke density is proposed.
提出了一种多密度网格聚类算法gdd。
This paper presents a grid - based clustering algorithm for multi - density (GDD).
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