Top of the world.
![](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Pederson_KaliAbel_2007_ChapmanPk_ByFagre_red.jpg?itok=FstFQUNA)
Detailed Description
USGS scientist Greg Pederson and field collaborator set up a repeat photograph in Glacier National Park.
USGS scientist Greg Pederson and field collaborator set up a repeat photograph in Glacier National Park.