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If you are a Study Participant, contact your Administrator directly as information in the Support Center is intended for qualified researchers and healthcare professionals. Misapplying the information below may affect your data collection.

Raw data in the Empatica Cloud

Where the Care App and Care Portal are mentioned, the articles in the Support Center refer to both the professional Plan (Care Lab App and Care Lab Portal) and the enterprise Plan (Care App and Care Portal), unless indicated otherwise.

The availability of Care Portal access on enterprise is defined by the study configuration. For further information on your study configuration, talk to your Study team or account manager.

High-frequency raw data is uploaded to the Empatica Cloud every 30 minutes and then made available on the S3 Data Bucket for download.

If you’d like to know more about how to access the S3 Data Bucket, please review our support article Accessing data on S3, which provides an overview of the various recommended methods.

High-frequency raw data is delivered in Avro format. Within the S3 Data Bucket, Avro files follow this naming convention:

[participant_id]_[utc_timestamp_start].avro

Data and filename timestamps always use UTC+00:00
Always account for the time difference between the participant’s time zone and UTC+00:00.

 

What is an Avro file?

Apache Avro™ is an open-source project that provides data serialization and data exchange services. It provides a compact, fast, binary data format, that allows for a significant reduction in the size of the stored data files. Avro files (extension .avro) use high-level schemas which are stored within the files themselves; this process ensures that the file can be opened and processed later by any program (Apache Avro™ 1.11.1 Documentation).

Avro files are self-contained: they expose the schema defining the format type, and the sampling rate of the data recorded by EmbracePlus.

Avro data format is platform-independent, and it offers an official API for Python, Java, C, C#, and C++. It is supported for MATLAB interface as well:

 

Avro files content

Each Avro file generated by the Empatica Cloud contains uninterrupted streams of raw data from every onboard sensor. The stream length is up to roughly 30 minutes, in case of recording interruptions, the stream may be shorter and a new Avro file is generated.

Raw data streams contained within Empatica's Avro files are the following:

Raw data Avro files also contain additional metadata, as well as sensor details:

  • Participant Full ID
  • Device serial number
  • Participant’s time offset from UTC+00:00
  • Sensors polling rate
  • ADC IMU parameters

Full details of data contained within Empatica's Avro files are available in the Data Access Documentation, accessible from the Care Portal, on the Data Access Keys page.

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