Int J Health Geogr - Using Google Street View for systematic observation of the built environment: analysis of spatio-temporal instability of imagery dates.

Tópicos

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Resumo

CKGROUND: Recently, Google Street View (GSV) has been examined as a tool for remotely conducting systematic observation of the built environment. Studies have found it offers benefits over in-person audits, including efficiency, safety, cost, and the potential to expand built environment research to larger areas and more places globally. However, one limitation has been the lack of documentation on the date of imagery collection. In 2011, Google began placing a date stamp on images which now enables investigation of this concern. This study questions the spatio-temporal stability in the GSV date stamp. Specifically, is the imagery collected contemporaneously? If not, how frequently and where is imagery from different time periods woven together to represent environmental conditions in a particular place. Furthermore, how much continuity exists in imagery for a particular time period? Answering these questions will provide guidance on the use of GSV as a tool for built environment audits.METHODS: GSV was used to virtually "drive" five sites that are a part of the authors' ongoing studies. Each street in the sites was "driven" one mouse-click at a time while observing the date stamp on each image. Every time the date stamp changed, this "disruption" was marked on the map. Every street segment in the site was coded by the date the imagery for that segment was collected. Spatial query and descriptive statistics were applied to understand the spatio-temporal patterns of imagery dates.RESULTS: Spatio-temporal instability is present in the dates of GSV imagery. Of the 353 disruptions, 82.4% occur close to (<25 m) intersections. The remainder occurs inconsistently in other locations. The extent of continuity for a set of images collected with the same date stamp ranged from 3.13 m to 3373.06 m, though the majority of continuous segments were less than 400 m.CONCLUSION: GSV offers some benefits over traditional built environment audits. However, this investigation empirically identifies a previously undocumented limitation in its application for research. Imagery dates can change often and without warning. Caution should be used at intersections where these disruptions are most likely to occur, though caution should be used everywhere when using GSV as a data collection tool.

Resumo Limpo

ckground recent googl street view gsv examin tool remot conduct systemat observ built environ studi found offer benefit inperson audit includ effici safeti cost potenti expand built environ research larger area place global howev one limit lack document date imageri collect googl began place date stamp imag now enabl investig concern studi question spatiotempor stabil gsv date stamp specif imageri collect contemporan frequent imageri differ time period woven togeth repres environment condit particular place furthermor much continu exist imageri particular time period answer question will provid guidanc use gsv tool built environ auditsmethod gsv use virtual drive five site part author ongo studi street site driven one mouseclick time observ date stamp imag everi time date stamp chang disrupt mark map everi street segment site code date imageri segment collect spatial queri descript statist appli understand spatiotempor pattern imageri datesresult spatiotempor instabl present date gsv imageri disrupt occur close m intersect remaind occur inconsist locat extent continu set imag collect date stamp rang m m though major continu segment less mconclus gsv offer benefit tradit built environ audit howev investig empir identifi previous undocu limit applic research imageri date can chang often without warn caution use intersect disrupt like occur though caution use everywher use gsv data collect tool

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