USGS researcher uses GPS-equipped backpack to measure sand elevations
![A man walks on the beach wearing a yellow backpack with an antenna sticking up from it, holding a small machine](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/PowerIMG_2015crDEScv.jpg?itok=AI5O5VkT)
Detailed Description
USGS oceanographer Dan Hoover uses a GPS-equipped backpack to measure sand elevations near the mouth of the San Lorenzo River in Santa Cruz, California, January 12, 2017. Surveys like this make long-term studies of coastal change possible.
Sources/Usage
Public Domain.