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标题：Development of Time-location Weighted Spatial Measures Using Global Positioning System Data
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作者：Daikwon Han ; Kiyoung Lee ; Jongyun Kim 等
期刊名称：Environmental Health and Toxicology
电子版ISSN：2233-6567
出版年度：2013
卷号：28
DOI：10.5620/eht.2013.28.e2013005
语种：English
出版社：Korean Society of Environmental Health and Toxicology
摘要：Objectives Despite increasing availability of global positioning system (GPS),no research has been conducted to analyze GPS data for exposure opportunities associated with time at indoor and outdoor microenvironments. We developed location-based and time-weighted spatial measures that incorporate indoor and outdoor time-location data collected by GPS. Methods Time-location data were drawn from 38 female subjects in California who wore a GPS device for seven days. Ambient standard deviational ellipse was determined based on outdoor locations and time duration,while indoor time weighted standard deviational ellipse (SDE) was developed to incorporate indoor and outdoor times and locations data into the ellipse measure. Results Our findings indicated that there was considerable difference in the sizes of exposure potential measures when indoor time was taken into consideration,and that they were associated with day type (weekday/weekend) and employment status. Conclusions This study provides evidence that time-location weighted measure may provide better accuracy in assessing exposure opportunities at different microenvironments. The use of GPS likely improves the geographical details and accuracy of time-location data,and further development of such location-time weighted spatial measure is encouraged.
关键词：Global positioning system;Indoor time-location weighted spatial measure;Time-location data