Glacier Outlines

1998 and 2015 outlines of the Sperry Glacier

Change in ice-covered area at USGS bechmark glaciers is tracked though the use of aerial and satellite imagery. For imagery acquired on a given date, a glacier outline can be created, and used to determine ice extent. Digitization of a glacier's perimeter results in a shape file and glacier area measurement which can be compared to other points in time, in order to determine change in glacier area and shape. The Montana benchmark glacier, Sperry Glacier, is included the regional analysis that includes the 37 named glaciers of Glacier National Park.

Sperry and Glacier National Park, MT