HR: 10:20h
AN: C42A-01 INVITED     [Abstracts]
TI: Photogrammetry for Glaciology
AU: * Brecher, H H
EM: brecher.1@osu.edu
AF: Byrd Polar Research Center The Ohio State University, 1090 Carmack Road, Columbus, OH 43210-1002 United States
AU: Thompson, L G
EM: thompson.3@osu.edu
AF: Byrd Polar Research Center The Ohio State University, 1090 Carmack Road, Columbus, OH 43210-1002 United States
AB: An "Introduction to Photogrammetry" is presented first and attention is called to some of the differences between satellite imagery and aerial photography. The application of some well-established aerial and terrestrial photogrammetry procedures, which have long been in general use for topographic mapping, to studies of glacier and ice sheet motion and extent is then discussed. Some examples of projects carried out by the first author are given: 1) surface motion studies from standard aerial mapping photography over relatively large areas (Byrd Glacier and one of the West Antarctic ice streams, Antarctica and Jakobshavn Glacier, Greenland), 2) studies of extent of relatively small pieces of ice from standard mapping photos (Mt. Kilimanjaro) and from unconventional, small-format photography (Deception Island, Antarctica) and 3) the application of terrestrial photogrammetry in the monitoring of the extent of Qori Kalis, the largest outlet glacier of the Quelccaya Icecap in the Peruvian Andes, over a period of more than 40 years. The results of the latter document accelerating rates of retreat of the terminus and loss of ice area and volume from 1963 to 2001. Retreat of the front was 42 times as fast between 2000 and 2001 as between 1963 and 1978. Since 2001, however, the retreat appears to have stopped, at least temporarily, as it did between 1991 and 1993. A proglacial lake formed sometime between 1983 and 1991 and presently covers about 31 ha.
DE: 9820 Techniques applicable in three or more fields
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
DE: 1224 Photogrammetry
DE: 1600 GLOBAL CHANGE (New category)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting