Travel time errors caused by geomasking might be different between transportation modes and types of urban area
Travel time errors caused by geomasking might be different between transportation modes and types of urban area
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DOI：
10.1111/tgis.12751
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发表时间：
2021-05
影响因子：
2.4
通讯作者：
Junghwan Kim;Mei‐Po Kwan
中科院分区：
文献类型：
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作者：
Junghwan Kim;Mei‐Po Kwan
本文以伊利诺斯州库克县为案例研究区，研究了两种广泛使用的测绘方法（聚合法和双峰高斯法）对基于汽车和交通工具的从人们的家到医疗机构的旅行时间误差的影响。它解决了两个研究问题：（Q1）不同的交通方式对出行时间误差的影响有何不同？（Q2）城市和郊区之间基于汽车和公共交通的出行时间误差有何不同？结果表明，测绘在行程时间上引入了相当大的误差。具体来说，基于交通工具的出行时间的误差明显高于基于汽车的出行时间。此外，当使用大半径进行测绘时，城市地区汽车出行时间的误差明显高于郊区。相反，城市交通的出行时间误差明显小于郊区。由于交通方式和城市区域类型在由地理图引起的旅行时间误差中起着至关重要的作用，研究人员需要在使用地理图地点进行分析时减轻这些误差（例如，评估某些设施的空间可达性，如医院或健康食品店）。
This article examines the effects of two widely used geomasking methods (aggregation and the bimodal Gaussian method) on errors in car‐ and transit‐based travel times from people's homes to health facilities using Cook County in Illinois as a case study area. It addresses two research questions: (Q1) How do the effects of geomasking on travel time errors differ between transportation modes? (Q2) How do errors in car‐ and transit‐based travel times differ between urban and suburban areas? The results indicate that geomasking introduces considerable errors in travel times. Specifically, errors in transit‐based travel times are significantly higher than those in car‐based travel times. Moreover, when large radii are used for geomasking, errors in car‐based travel times in urban areas are significantly higher than those in suburban areas. On the contrary, transit‐based travel time errors in urban areas are significantly lower than those in suburban areas. Because transportation modes and urban area types play essential roles in travel time errors caused by geomasking, researchers need to mitigate these errors when using geomasked locations for their analysis (e.g., evaluating the spatial accessibility of certain facilities, such as hospitals or healthy food outlets).