1. Petermann Glacier and Jakobshavn Isbrae Glacier By: Rachel Soika and Paul Swanson

2. Objectives • To Document the change of Petermann Glacier in comparison to changes in Jakobshavn Isbrae Glacier • Landsat4-7 archives • Decadal comparisons • Jakobshavn Isbrae 1985-2011 • Petermann 2000-2011

3. Data Information • Jakobshavn Isbrae • Located in West Greenland near the town, Ilulissat. • It is considered a large outlet glacier that enters the Ilulissat Icefjord. • The coordinates are 69.1667 latitude and -49.8333 longitude. • Approximate size is 1000 meters.

4. Data Information • Petermann Glacier • located in Northwest Greenland and east of the Nares Strait. • The coordinates are 80.5000 latitude and -59.5000 longitude. • Approximate size is 1000 meters.

5. Methods Used • Unsupervised Classification • Used as reference for rest of project • Supervised Classification • Image Difference

6. Petermann Glacier • Top Right taken in 2000 • Below taken in 2011

7. Unsupervised Classification- Petermann Glacier • Top Left is 2000 • Below is 2011

8. Supervised Classification Classes for Petermann Glacier • SnowMagenta • Glacier/Ice waterCyan • WaterBlue • RockBrown • Dark IcePurple • Blue IceOrange • Snow RidgesYellow • Thick IceLight Green

9. Supervised classification Petermann Glacier • Top Right 2000 • Below left 2011

10. Image Difference- Petermann Glacier • Mostly Decrease • Problems with satellite streaking

11. Jakobshavn Isbrae Glacier • Top Right is 1985 • Below is 1992

12. Jackobshavn Isbrae Glacier continued • Top Right is 2000 • Below is 2011

13. Unsupervised Classification Jakobshavn Isbrae • Top left 1985 • Below 1992

14. Unsupervised Classification Jakobshavn Isbrae • Top Right 2000 • Below 2011

15. Supervised Classification Classes- Jakobshavn Isbrae Glacier • Snow Magenta • Glacier/Ice waterCyan • WaterBlue • RockBrown • Elevated RockMaroon • Dark IcePurple • Blue Ice Orange • Snow Ridges Yellow • Thick Ice Light Green

16. Supervised Classification Jakobshavn Isbrae • Top Left 1985 • Below 1992

17. Supervised Classification Jakobshavn Isbrae • Top Right 2000 • Below 2011

18. Image Difference- Jakobshavn Isbrae • Top Left compares 1985 and 1992 • Below compares 1992 and 2000

19. Image Difference- Jakobshavn Isbrae • Top Right compares 2000 and 2011 • Below Compares 1985 and 2011

20. Results and Data Usage • Clear Change between 1985 and 2011 for Jakobshavn Isbrae • Indication of change for Petermann Glacier between 2000 and 2011 • No accuracy assessment • Confident in using data for comparison and documenting change

21. Encountered Problems • Constantly needed to Re-layer Data • Had problems with streaking • The Image difference was a little off between the 1990’s data and 2000 data

22. Repercussions of Melting Glaciers • Rising sea levels • Less Icebergs • Warmer water temperatures