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DEM differencing – glaciers Athabasca Glacier 1919 - 2005

Lloyd George outlet glacier, August 2005 (by guide outfitters)

Lloyd George Icefield LIA 1850 - red TRIM 1986 – green Landsat 2001- yellow

Data sources for glacier DEMs National Topographic maps 1945-85 BC provincial TRIM data 1981-89 SRTM (Shuttle Radar) 2000 (1999) ASTER Global DEM 2000-08 Additional sources Historic and glacier maps 1890-1975 Air photos 1945-2010 SPOT 2002-2010 LiDAR 2005-2007

This is a close up of the DEM and with extents of the ASTER scenes I’ll be spending most of the talk considering glaciers in the Coast Mountains here shown with colors denoting elevations and superimposed on the TRIM DEM with illumination from the northwest. Many of these ice files

ASTER imagery 2000 SRTM – TRIM 2000-1987 Here is a closeup of Klinaklini glacier with the available NTDB ice extents and the extents that are provided by one of our research partners the BC government. It shows that changes in area for these larger glaciers is not always a good surrogate for changes in ice volume. However, we can use the contours from these older maps to produce former surfaces of these glaciers and develop DEMs using ASTER imagery. We can see from the upper right image that Klinaklini glacier Lost over 150 m near its terminus and that between 1970 and 2000 the glacier lost at least 8 cubic kilometers of ice. ASTER imagery 2000

(Homathko River Park) Result of subtraction of 2 DEMs TRIM - NTDB SRTM –TRIM SRTM - NTDB

SPOT SPIRIT DEM products – Alaska/NW BC/Yukon 27 May 2008 British Columbia Alaska ‘panhandle’ 56.8N, 131.5W

20 km Porcupine Glacier Hoodoo Mountain Map from BC Mapserver Mud Gl. Darsmith Gl. Choquette Gl. Hoodoo Gl. Johnson Gl. Porcupine Glacier 20 km Hoodoo Mountain Map from BC Mapserver www.lrdw.ca - imap http://www.flightsimplaza.com/tongass//TongassX/Tongass_Fjords_X_comp/TongassX_comp_FS9.html

2005 glacier inventory (from TM) – Bolch et al (2010)

BC provincial ‘TRIM’ mapping 1982

SRTM DEM + 2000 glaciers

SPOT SPIRIT DEM 27 May 2008 (+ 2005 glaciers)

Metres of maximum ice wastage = elevation loss; annual rate in (brackets) Glacier 1965-82 1982-2000 2000-08 1965-2008 Area05 Area% km2 82-05* Porcupine e 91 (5.3) 108 (6.3) 49 (6.1) 204 (4.9) 48 -4.2 Porcupine w 50 (3.0) 74 (4.3) 44 (5.5) 134 (3.2) 102 -5.0 Hoodoo 129 (7.6) 173 (10.0) 78 (9.7) 270 (6.4) 40 -17.8

Andrei / Forrest Kerr Glaciers 1 km 2005 Landsat TM Extents: 1965, 1982, 2005

Federal mapping 1965 5 km

BC provincial ‘TRIM’ 1982

Shuttle Radar Topography Mission (SRTM) 1999

Aster 2000 -2008 (2005 glacier vectors)

http://www.globglacier.ch/docs/paul_haeberli_08_grl.pdf

Svalbard, Norway http://folk.uio.no/kaeaeb/publications/tgars08.pdf

Comparison of DEMs for glaciers in the Himalayas FLY: http://www.geus.dk/viden_om/voii/ilulissat-uk/index-uk.html