Introducer(s): Bruce Molnia - U.S. Geological Survey Session Description: Repeat photography is a technique in which a historical photograph and a modern photograph, both having the same field of view, are compared and contrasted to quantitatively and qualitatively determine their similarities and differences. The use of repeat photography to document temporal change in glaciers and mountainous landscapes is not new. It originated as a glacier-monitoring technique in the European Alps more than a century ago. Today, many researchers are systematically applying repeat photography to photographically document glacier and landscape change in a multitude of locations around the world, including western North America, Europe, Equatorial Africa, Asia, and Iceland. Sequential photographic pairs may be ground-based, aerial, or spaced-based in origin. Through analysis and interpretation of these photographs, both quantitative and qualitative information is extracted to document landscape evolution and glacier dynamics on time scales that range from inter-annual to multiple-decadal. Areas of investigation range from individual glaciers and associated landscapes to entire mountain ranges. The session welcomes contributions related to all aspects of repeat photography, ranging from glacier their techniques, methodologies, and applications, to results. One focus will be vegetative succession following glacier retreat. If you wish to participate, please contact: Bruce F. Molnia, USGS, 926A National Center, Reston, VA 20192; phone: 703-648-4120; fax: 703-648-6953; email: bmolnia@usgs.gov
