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SenseDoc
The SenseDoc is a research grade multisensor device, made by MobySens, and used for mobility (GPS) and physical activity (accelerometer) tracking. These data are collected continuously and allow us to measure location-based physical activity and infer transportation mode.
The data fields collected by the SenseDoc can be found on INTERACT's Data Dictionary
Data is pulled from the individual devices by the regional coordinator, using an extraction tool provided by MobySens. While this extraction includes the proprietary raw data files, they are also coalesced into a SQLite3 DB file (and given a .sdb extension) for more efficient manipulation. Our migration process preserves those raw data files, but the ingest process is built against the SDB files, since they are in a much more consumable form.
When a participant has completed their collection cycle, the SenseDoc is given to the regional coordinator, who then extracts the data. This means that the device may include some movement data contributed by the coordinator, as well as that contributed by the participant. So to filter the data properly, the coordinator maintains a "wear date window" consisting of a start and end timestamp for when the device was actually being worn by the participant. This data is kept in the participant metadata table.