GPS campaign survey equipment, YNP.
Detailed Description
A high-precision Global Positioning Systems (GPS) antenna used to monitor horizontal and vertical ground motions of the Yellowstone caldera, Yellowstone National Park. This is one of 60 sites that are periodically observed and used to measure how the Yellowstone caldera moves up and down in response to magmatic fluid transport of the Yellowstone volcanic system.
Sources/Usage
Public Domain.