基于出租车OD数据的居民活动强度时空特征研究
Spatial and temporal patterns of residents activity intensity based on taxi OD data

以福州市区出租车GPS轨迹数据为数据源研究面向地理空间的居民活动时空规律. 首先探析出租车起源地-目的地(OD)空间分布和时间分布特征；接着采用基于道路中心点区划方法确定空间研究单元，将时间分为6个时间段，以活动强度为主要研究对象探索其时空变化规律；最后结合出租车乘客的出入情况实现对研究区内居民活动时空规律的进一步探索. 研究发现，主城区居民夜间活动规律总体上比白天明显，尤其是晚21点之后，主城区总体的居民活动强度达到一天的顶峰，核心区内外的活动强度以及出入特征差异突出，核心区内的居民活动优势最明显，有成片聚集的特征；白天大部分时间的居民总体活动强度变化稳定但空间分布规律不明显；通勤早高峰时段的出租车活动强度为全天最低并且大部分区域以流出为主.
This article intends to explore the spatial and temporal patterns of resident activities using GPS data of 500 taxis in Fuzhou city. Based on the analyst of spatial and temporal distribution of pick up and drop off positions of passengers，namely origin-destination(OD) points，we first divide the whole city area into 623 research units based on street crosses，and explore the spatial and temporal patterns of activity intensity for each unit by 6 periods. Further，we investigate spatial and temporal patterns of the passenger NFR(net flow ratio) that provides an new insight to residents activities pattern. The study shows that the pattern of resident activities is more obvious during the night especially after 21:00 PM than that in daytime，and the overall activity intensity reaches the maximum value of the day during this period. Besides，the distinction of activities between inside and outside the core area is more obvious at night，and there are characteristics of agglomeration for activities of the residents in the core area. The taxi activity intensities for overall area has a stable change during daylight，with an less obvious discipline of spatial distribution. During the morning rush hour，most units have an minim taxi activity intensities value and residents in these areas have greater tendency to flow out