Use of digital stereo photogrammetry to spatially quantify through time the loss of ice mass on Midre Lovenbreen, Austre Broggerbreen and Slakbreen. Pairs of stereo areial photographs from each glacier will be processed to create digital elevation models from at least three periods over the last 30-50 years, and differencing them will give a highly accurate view of glacier retreat through time which can be linked through models to climate change analysis.