Start time of aggregation

Each measurement is taken to represent an interval of duration equal to the sampling interval (In this data set, the sampling interval is 10 seconds). This attribute represents the time of day of the beginning of the interval represented by the first measurement in the aggregation.

ATTRIBUTE-ACCURACY

Times are derived from the volunteers watch, and are considered to be accurate within a couple of minutes.

DOMAIN

A positive integer presented as HHMMSS, where HH represents the hour of the day (in 24-hour time), MM represents the minute within the hour, and SS represents the second within the minute.