Recent studies have relied on GPS tracking to assess exposure to environmental characteristics over
daily life schedules.Combining GPS and GIS allows for advances in environmental exposure assessment. However,biases related to selective daily mobility preclude assessment of environmental effects,
to the extent that these studies may represent a step backward in terms of assessment of causal effects.
A solution may be to integrate the Public health/ Nutrition approach and the Transportation approach
to GPS studies,so as to combine a GPS and accelerometer data collection with an electronic mobility
survey. Correcting exposure measures and improving study designs with this approach may permit
mitigating biases related to selective daily mobility.