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CROS

i-log data collection

A set of volunteers have collected data via two different apps from smart phones. The apps recorded data from the smart phone sensors, which were complemented by questions on current type and place of activities, as well as on the company of additional persons. Data were collected within a time frame of 2 weeks.

When installing the app, personal characteristics, namely gender/ occupation/ main activity status/ employer/ place of employment were asked;

At a time interval of 1 hour, users provided information about activities, location, mode of transport, additional persons being with the respondent and about the respondent's mood.

Table 1 List of i-Log user input

Activities

Location

Mode of transport

Who is with you?

sleeping

home

on foot

nobody

eating

workplace or school

by bicycle

partner

doing personal care, e.g. showering

other people’s home

by motorcycle

other relative(s) who live with me

working (paid for)

restaurant or canteen

by car

other relative(s) who do not live with me

studying

cafe or pub

by bus

friend(s)

doing housework

shopping centres, markets, other shops

by metro/subway

work colleague(s)

caring for children/family

hotel, guesthouse, camping site

by train

other person(s) known to the respondent

engaging in voluntary work

public garden, park, playground

other transport mode not listed above

engaging socially with other people

square or urban area

engaging in social media

forest or rural area

talking on the phone

gym, swimming pool

participating in cultural activities

cinema, theatre, museum

reading

other place not listed above

doing sport and outdoor activities

engaging in hobbies, other leisure activity

going to or coming from work/study

travelling

doing nothing

other activity not listed above

Sensor data: i-Log is designed to collect data from multiple sensors simultaneously, both hardware (e.g., GPS , accelerometer, gyroscope, among others) and software (e.g., in/out calls, applications running on the device). Table 2 shows the complete list of sensors that i-Log can collect depending on those available on the smartphone it is installed on. When collecting data from all the sensors, the total amount of data can easily reach 1GB within one day.

Table 2 List of i-Log Sensors

Acceleration

Temperature

WIFI Available

SMS Out Event

Linear Acceleration

Audio mode

BT Device

Running Apps

Gyroscope

Pressure

BLE Available

Screen Status

Gravity

Humidity

Battery Charge

Available Notifications

Rotation Vector

Proximity

Calls In Event

Doze Mode

Magnetic Field

Position

Calls Out Event

Battery Level

Orientation

WIFI Connected

SMS In Event

Headset

Touch events

Automatically, sensor data, specifically acceleration/ gyroscope/ gravity/ rotation vector/ magnetic field/ orientation/ temperature/ atmospheric pressure/ humidity/ proximity/ position/ wifi network connections/ running applications/ screen status, flight mode, battery status, doze modality/ headset, audio mode, music playback (no track info)/ notifications received, touch event/ cellular network info.