Collecting survey data on activities and trips would be useful
to Public health researchers, not only to correct the estimated
environmental effects on health behavior from selective daily
mobility biases. It would also allow them to reconstruct missing
portions of trajectories. In the absence of GPS data (loss of signal,
empty battery, etc.), surrogate locational information from the
survey could be matched to accelerometry data. With this
approach, it might be possible to include in the analyses indoor
activity places that are often excluded from momentary analyses
and to not exclude participants with insufficient GPS data. As a