Repeat photography is a technique in which a historical photo and a modern photo, both taken with the same field of view, are put side by side to determine their similarities and differences.

The following collection depict how this technique was used to document and better understand the effect of the changing climate to glaciers and landscapes for the last century-and-a-quarter.
 

Muir Inlet, Glacier Bay National Park and Preserve, Alaska

1892

H. F. Reid photograph, muir1892_417, courtesy of National Snow and Ice Data Center

2005

USGS Photograph by Bruce F. Molnia

1880s – 1890s

G. D. Hazard, 7807, courtesy of Glacier Bay National Park and Preserve Archive

2005

USGS Photograph by Bruce F. Molnia

Late-19th century

(L.V. Winter and P. E. Pond, postcard # C141 in the personal collection of the author

105 - 110 years later...

USGS Photograph by Bruce F. Molnia

1895

Alaska State Library Photograph by Winter and Pond

2004

USGS Photograph by Bruce F. Molnia

1899

USGS Photo Library Photograph - Gilbert 276

2003

USGS Photograph by Bruce F. Molnia

1899

USGS Photo Library Photograph - Gilbert 278

2003

USGS Photograph by Bruce F. Molnia

Reid Inlet, Glacier Bay National Park and Preserve, Alaska

1899

G. K. Gilbert, 258, courtesy of the USGS Photographic Library

104 years later

USGS Photograph by Bruce F. Molnia

1924

A. H. Brooks, 1299, courtesy of the USGS Photographic Library

2003

USGS Photograph by Bruce F. Molnia

 

Lamplugh Glacier

1941

Field photograph # 430-41

2003

USGS Photograph by Bruce F. Molnia

 

Triangle Island, Queen Inlet, Glacier Bay National Park and Preserve, Alaska

1906

USGS Photo Library Photograph - Wright 333

2003

USGS Photograph by Bruce F. Molnia

1906

USGS Photo Library Photograph - Wright 333

2004

USGS Photograph by Bruce F. Molnia

 

Pedersen Glacier, Aialik Bay, Kenai Fjords National Park, Alaska

1909

USGS Photo Library Photograph–Grant 131

2004

USGS Photograph by Bruce F. Molnia

1909

USGS Photo Library Photograph – Grant 130

2005

USGS Photograph by Bruce F. Molnia

 

Yalik Glacier, Kenai Fjords National Park, Kenai Mountains, Nuka Passage, Alaska

1909

USGS Photo Library Photograph – Grant 235

2004

USGS Photograph by Bruce F. Molnia

 

Aialik Glacier, Kenai Fjords National Park, Kenai Mountains, Aialik Bay, Alaska

1909

USGS Photo Library Photograph –Grant 128

2005

USGS Photograph by Bruce F. Molnia

 

McCarty Fjord, Kenai Fjords National Park, Alaska

1909

USGS Photo Library Photograph – Grant 143

2004

USGS Photograph by Bruce F. Molnia

1909

USGS Photo Library Photograph – Grant 144

2004

USGS Photograph by Bruce F. Molnia

1909

USGS photograph by D.F. Higgins

2004

USGS Photograph by Bruce F. Molnia

Holgate Arm, Aialik Bay, Kenai Fjords National Park, Alaska

1909

USGS Photo Library Photograph–Grant 132

2004

USGS Photograph by Bruce F. Molnia

 

Bear Glacier, Kenai Mountains, Kenai Fjords National Park, Alaska

1909

USGS Photo Library - Photograph Grant 123

2005

USGS Photograph by Bruce F. Molnia

1909

USGS Photo Library - Photograph Grant 120

2005

USGS Photograph by Bruce F. Molnia

Older photo, undated

Kenai Fjords National Park

2005

USGS Photograph by Bruce F. Molnia

 

Harris Bay, Kenai Fjords National Park, Kenai Mountains, Alaska

1909

USGS Photo Library - Photograph Grant 136

2004

USGS Photograph by Bruce F. Molnia

1909

USGS Photo Library - Photograph Grant 137

2004

USGS Photograph by Bruce F. Molnia

Harvard Arm, College Fiord, Prince William Sound, Chugach National Forest, Alaska

1909

USGS Photo Library Photograph–Grant 208

2000

USGS Photograph by Bruce F. Molnia

 

Toboggan Glacier, Harriman Fiord, Prince William Sound, Chugach National Forest, Alaska

1905

USGS Photo by Sidney Paige - 731

2000

USGS Photograph by Bruce F. Molnia

 

East Fork of the Teklanika River, Denali National Park and Preserve, Alaska

1919

USGS Photo Library Photograph – Capps

2004

2004 NPS Photograph by Ron Karpilo