GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets.

ABSTRACT: To assess differences between GPS and self-reported measures of location, we examined visits to fast food restaurants and supermarkets using a spatiotemporal framework. Data came from 446 participants who responded to a survey, filled out travel diaries of places visited, and wore a GPS receiver for seven consecutive days. Provided by Public Health Seattle King County, addresses from food permit data were matched to King County tax assessor parcels in a GIS. A three-step process was used to verify travel-diary reported visits using GPS records: (1) GPS records were temporally matched if their timestamps were within the time window created by the arrival and departure times reported in the travel diary; (2) the temporally matched GPS records were then spatially matched if they were located

SUBMITTER: Scully JY 

PROVIDER: S-EPMC5384745 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature