Document Detail


Field validation of food service listings: a comparison of commercial and online geographic information system databases.
MedLine Citation:
PMID:  23066385     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Many studies examining the food retail environment rely on geographic information system (GIS) databases for location information. The purpose of this study was to validate information provided by two GIS databases, comparing the positional accuracy of food service places within a 1 km circular buffer surrounding 34 schools in Ontario, Canada. A commercial database (InfoCanada) and an online database (Yellow Pages) provided the addresses of food service places. Actual locations were measured using a global positioning system (GPS) device. The InfoCanada and Yellow Pages GIS databases provided the locations for 973 and 675 food service places, respectively. Overall, 749 (77.1%) and 595 (88.2%) of these were located in the field. The online database had a higher proportion of food service places found in the field. The GIS locations of 25% of the food service places were located within approximately 15 m of their actual location, 50% were within 25 m, and 75% were within 50 m. This validation study provided a detailed assessment of errors in the measurement of the location of food service places in the two databases. The location information was more accurate for the online database, however, when matching criteria were more conservative, there were no observed differences in error between the databases.
Authors:
Laura Seliske; William Pickett; Rebecca Bates; Ian Janssen
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies     Date:  2012-07-25
Journal Detail:
Title:  International journal of environmental research and public health     Volume:  9     ISSN:  1660-4601     ISO Abbreviation:  Int J Environ Res Public Health     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-10-15     Completed Date:  2013-03-17     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101238455     Medline TA:  Int J Environ Res Public Health     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  2601-7     Citation Subset:  IM    
Affiliation:
Department of Community Health & Epidemiology, Queen's University, Kingston, ON, Canada. lseliske@gmail.com
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MeSH Terms
Descriptor/Qualifier:
Databases as Topic
Food Services*
Geographic Information Systems*
Internet
Grant Support
ID/Acronym/Agency:
MOP 97962//Canadian Institutes of Health Research
Comments/Corrections

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