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.
Illustration showing how to maneuver around a large obstacle for drag sampling. Three parallel linear transects are depicted (red dashed lines), with stake flags designating 15 m intervals. The middle transect has a tree obstructing the linear path. When maneuvering around the obstruction, dragging should continue only when moving parallel to the original transect (solid black lines), but not when maneuvering to the left or right around the obstruction (dashed black lines).
