Helicopter towing large sensor
![Photo of helicopter towing large sensor that looks like hula hoop.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/Coalinga%20Helicopter%20Survey_0.jpeg?itok=f8NdCUVc)
Detailed Description
This helicopter will fly along pre-planned flight paths in the Coalinga area at a relatively low to the ground at 100-200 feet above the surface. A sensor that resembles a large hula-hoop will be towed beneath the helicopter to measure small electromagnetic signals that can be used to map geologic features below Earth’s surface.
Sources/Usage
Public Domain.
Credit U.S. Geological Survey