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.
Example of a GPS trajectory throughout a session. GPS points are color-coded as being within the vicinity of the household (50m buffer), community boundaries or elsewhere. Outlines of arbitrary shapes represent buildings in the area and lines represent roadways.
