Google Earth was used to obtain approximate photo coordinates to aid relocation of the photo point in the field. Historic photographs were selected for repeat photography based on the image containing clearly exposed bare ice and glacier margins that are not obscured by seasonal snow. Historic glacier images for the USGS Repeat Photography Project were selected from collections at Glacier National Park Archives, the University of Montana Archives Photography Collections and the USGS Photographic Library. The images have inspired artistic collaborations and museum displays, the creation of teaching materials, and a variety of public uses of the imagery which include quilting, modern dance performance, and the inclusion on a gold-plated disc orbiting the Earth with a selection of images that represent humanity.
Efforts to capture, archive, and provide publicly accessible images became known as the USGS Repeat Photography Project, which generated a collection of over sixty repeat photo pairs.
Repeat photo pairs were immediately popular with the media and the public as visual representations of the impact of climate change on glaciers. Historic and modern era photo pairs were then displayed side by side in Park hotels, museums, and as shown on the GNP Glacier Repeat Photos website, for viewers to compare and assess landscape change. USGS staff and volunteers generated repeat photograph pairs by taking copies of historic photos into the field, finding the precise location where that photograph was taken, and then repeating the same photo, years apart. An abundance of historic glacier imagery, captured by early twentieth century photographers interested in tourism promotion and scientific study, provides the foundation for repeat photography in Glacier National Park (GNP). In 1997 the USGS began re-photographing historic glacier images to document changes to the park’s namesake features. McKeon, USGS Northern Rocky Mountain Science Center. Red dots indicate that the associated glacier has at least one repeat photo pair in the Repeat Photography Collection.
Map of glaciers re-photographed by USGS in Glacier National Park.
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