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SensorKit Export Overview

You will need to contact us in order to have the SensorKit data export enabled for your project. Please refer to the Enabling SensorKit for your project article for further details on SensorKit.

SensorKit data are generated by a participant's Apple iPhone and paired Apple Watch. These data are available for data export in a JSON format within MyDataHelps Designer.

SensorKit export files tend to contain a large volume of data. Accelerometer and rotation rate sensors can generate 3 GB of uncompressed data per day per participant. Other sensor data tends to be closer to 3.5 MB of uncompressed data per participant per day, which can still add up with high enrollment over a study’s duration (100 participants over a 60 day study duration would be 21 GB for that sensor alone).

Please note that Apple occassionally will report out duplicate samples. We strongly encourage project teams to review the data exports for duplicate samples (testing shows close to 1% of samples) and remove them from analysis.

Folder Structure

Exported SensorKit data is stored in the following folder hierarchy:

  1. Sample Type: Sensor type
  2. Device Type: iPhone or Watch
  3. Participant ID: The stable, automatically generated, internal system identifier for this participant.
  4. Device ID: Unique identifier for the participant's device
  5. Sample Timestamp: Timestamp for the sample

Data Fields

The following data elements are included within SensorKit data exports:

Apple Sample Type Data Fields

Please refer to Apple's documentation for each sensor's sample type data elements:

The filename timestamps refer to the query timeframe, rather than the sample timeframe.