Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
An example activity trajectory, which tracks the spatiotemporal path of a person through a 24 hour period. Time increases along the vertical axis, while the momentary position is captured in the XY plane. Each dot represents the start of a new activity. The dashed line represents the home axis, where the majority of personal activities are expected to occur.
