1. The Geography Students Association Presents:
Pub Night
&
Dance Party
Thursday Feb. 3rd
Free Appy’s! Cheap Shots! Drink Specials!
The Riverstone Bar and Grill th Ave
Thursday Feb. 3rd 2011
Doors at 9pm
Tickets 10$

2. DEM differencing – glaciers Athabasca Glacier 1919 - 2005

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

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

5. Data sources for glacier DEMs
National Topographic maps
BC provincial TRIM data
SRTM (Shuttle Radar) (1999)
ASTER Global DEM
Additional sources
Historic and glacier maps
Air photos
SPOT
LiDAR

6. 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

7. 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

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

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

10. 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
- imap

11. 2005 glacier inventory (from TM) – Bolch et al (2010)

12. BC provincial ‘TRIM’ mapping 1982

13. SRTM DEM glaciers

14. SPOT SPIRIT DEM 27 May 2008 (+ 2005 glaciers)

15. Metres of maximum ice wastage = elevation loss; annual rate in (brackets)
Glacier Area05 Area%
km *
Porcupine e 91 (5.3) (6.3) 49 (6.1) (4.9)
Porcupine w 50 (3.0) (4.3) 44 (5.5) (3.2)
Hoodoo (7.6) 173 (10.0) 78 (9.7) (6.4)

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

18. Federal mapping 1965
5 km

19. BC provincial ‘TRIM’ 1982

20. Shuttle Radar Topography Mission (SRTM) 1999

21. Aster 2000 -2008 (2005 glacier vectors)

28. Svalbard, Norway

29. Comparison of DEMs for glaciers in the Himalayas
FLY: