Repeat Photography Reveals How Glaciers Change Over Time
Higgs didn’t know it at first, but he’d stumbled onto a research technique
called repeat photography, which dates back more than a century. But it took until the late 1950s for the true potential of repeat
photography to emerge, when two scientists at the University of Arizona set
out to study the ecology of the Sonoran Desert. “Once you start looking at old photographs, you look at things a whole
different way,” says Robert Webb, a retired U.S. Geological Survey
hydrologist and repeat photographer who worked closely with Turner on a
second edition of the book, published in 2003.
Source: discovermagazine.com