More than 50 years ago, as part of the International Geophysical Year (IGY), nine Alaskan glaciers were photographed and mapped at a 1:10,000 scale by the American Geographical Society (AGS) to: “ provide the basis for more satisfactory and more accurate interpretation of the response of these glaciers to meteorological and other factors.” The USGS Ice and Climate Project working with the Global Fiducials Program (https://lta.cr.usgs.gov?GFL) re-photographed these glaciers, along with several additional glacier sites. Newly acquired and historical imagery will be used to determine changes in terminus position, produce digital elevation models (DEMs), and generate velocity fields from crevasse migration. Each pair of glacier maps will be accompanied with a summary document describing the changes that have occurred at that glacier. Changes mapped for the glaciers are in agreement with the annual mass balance records compiled by detailed USGS field investigations.
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U.S. Department of the Interior