如何确定轨道站影响范围（站域）是研究轨道与城市空间问题的基础，该问题涉及居民步行距离与轨道乘坐意愿的关系。距离是影响人们步行出行的重要因素，影响公共基础设施的服务范围。目前针对步行距离因素如何影响居民轨道通勤出行意愿的定量研究尚少，这种局面对于定量理解轨道站的影响范围（站域）非常不利。基于725栋香港居住建筑轨道通勤出行意愿调查结果的研究，运用了指数距离衰减模型对香港居民步行距离和轨道乘坐意愿进行关联分析，通过比对不同距离区间衰减系数‘β’的变化趋势，分析了真实步行距离如何影响港铁通勤出行的意愿和距离阈值空间。步行距离阈值范围的研究为分级确定轨道站影响区域提供了定量的依据；使用绕路系数指标可以评价站域空间结构，并为轨道站周边空间的建设与整合提供量化依据。%Catchment area is one of crucial issues in research of transit system and urban space. Based on survey of MTR commuting travel rate in Hong Kong, this research employed exponent distance decay model to analyze on how distance impact on metro riding intent. Based on surveys of MTR commuting rate from 725 residential buildings, the ranges of thresholds can be concluded where distance impacting on riding intent intensively through comparative study of the measuring of decay coefficient, whereby the catchment area of metro station can be defined quantitatively by factors as detour rate and walking distance.
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