For a large number of glaciers, the use of satellite images taken at different times has proven to be useful for the study of glacier changes over large areas.
Several change detection techniques can be used to measure glacier change, and depending on the task, several can be suitable. Presently, scientists worldwide prefer the GIS method forthe quantification of glacier changes, because the saved glacier outline files can be easily exchanged, distributed and analysed. The GIS method also allows them to combine more than two glacier stages.
As you have seen from the exercises, glacier change cannot always be easily and clearly recognised. Visible changes may not only stem from glacier changes. Snow patches around the glaciers, for instance, can change in a short time and suggest glacier change, even if the glacier itself has not changed. Even different illumination conditions may suggest change whenthere is none.
Nevertheless, the remote sensing techniques that were introduced here allow scientists, for the first time in history, to detect glacier change on a global scale. This allows them to analyse climate change and its impact on glaciers even for very remote areas where no ground-based meteorological measurements exist.
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Climate change and glaciers
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| • | Introduction (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMJWGH2SDH_0.html) |
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| • | Background (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMJXGH2SDH_0.html) |
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Exercises
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| • | Worksheet introduction (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEM5ZGH2SDH_0.html) |
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| • | Exercise 1: Inspection of true colour RGB composites (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMIAJH2SDH_0.html) |
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| • | Exercise 2: Animation (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMUEJH2SDH_0.html) |
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| • | Exercise 3: Band Arithmetic (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMMFJH2SDH_0.html) |
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| • | Exercise 4: GIS (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMDHJH2SDH_0.html) |
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| • | Exercise 5: Measurement of area (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMPIJH2SDH_0.html) |
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| • | Exercise 6: Multitemporal analysis (http://www.esa.int/SPECIALS/Eduspace_Global_EN/SEMDKJH2SDH_0.html) |
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Eduspace - Software
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| • | LEOWorks 4 (MacOS) (http://leoworks.asrc.ro/download/leoworks.app.zip) |
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| • | LEOWorks 4 (Linux) (http://leoworks.asrc.ro/download/leoworks.jar) |
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| • | LEOWorks 4 (Windows) (http://leoworks.asrc.ro/download/leoworks.exe) |
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Eduspace - Download
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| • | Andes_images.zip (http://esamultimedia.esa.int/docs/eduspace/Andes_images.zip) |
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| • | GoogleEarth file (http://esamultimedia.esa.int/multimedia/GoogleEarth_file eduspace_glacier.kmz) |
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