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"Identifying Active Travel Behaviors In Challenging Environments Using GPS, Accelerometers, And Machine Learning Algorithms." and the language of the book is English.


“Identifying Active Travel Behaviors In Challenging Environments Using GPS, Accelerometers, And Machine Learning Algorithms.” Metadata:

  • Title: ➤  Identifying Active Travel Behaviors In Challenging Environments Using GPS, Accelerometers, And Machine Learning Algorithms.
  • Authors: ➤  
  • Language: English

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  • Internet Archive ID: pubmed-PMC4001067

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This article is from <a href="//archive.org/search.php?query=journaltitle%3A%28Frontiers%20in%20Public%20Health%29" rel="nofollow">Frontiers in Public Health</a>, <a href="//archive.org/search.php?query=journaltitle%3A%28Frontiers%20in%20Public%20Health%29%20AND%20volume%3A%282%29" rel="nofollow">volume 2</a>.<h2>Abstract</h2>Background: Active travel is an important area in physical activity research, but objective measurement of active travel is still difficult. Automated methods to measure travel behaviors will improve research in this area. In this paper, we present a supervised machine learning method for transportation mode prediction from global positioning system (GPS) and accelerometer data.Methods: We collected a dataset of about 150 h of GPS and accelerometer data from two research assistants following a protocol of prescribed trips consisting of five activities: bicycling, riding in a vehicle, walking, sitting, and standing. We extracted 49 features from 1-min windows of this data. We compared the performance of several machine learning algorithms and chose a random forest algorithm to classify the transportation mode. We used a moving average output filter to smooth the output predictions over time.Results: The random forest algorithm achieved 89.8% cross-validated accuracy on this dataset. Adding the moving average filter to smooth output predictions increased the cross-validated accuracy to 91.9%.Conclusion: Machine learning methods are a viable approach for automating measurement of active travel, particularly for measuring travel activities that traditional accelerometer data processing methods misclassify, such as bicycling and vehicle travel.

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