Pedestrian simulation is widely used in designing the layout of public facilities, optimizing the plan of emergency evacuation and many other fields. Most of the simulation models only consider the individuals. But pedestrian groups' features and impacts on the crowd must not be ignored in order to make the simulation results much closer to real situations. In recent years, many researches on group features have been done for 2-4 member groups, but larger groups with more than 5 members are rarely involved. In this paper, spatial distribution of the members in large social pedestrian groups is analyzed with observation and experiment data. It is found that 2-3 pattern and 3-2 pattern are stable patterns for 5-member groups and the 3-member row is always more scattered. Besides, the range and probability of spatial distribution of each group member are calculated and given.
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