Biddle,, Donald J. 1982-, "Mapping debris-covered glaciers in the Cordillera Blanca, Peru : an object-based image analysis approach." (2015).
ACKNOWLEDGEMENTSThere are so many people without whose guidance and support this thesis would not have come to fruition. To thank them all by name would be major work in its own right! If I must pare the list for this limited space it should begin with my advisors, Dr. Keith Mountain and Dr. Andrea Gaughan. They challenged me to be the best version of myself, even -nay -especially when it was not the easiest way forward. Thank you also to Dr.Michael Croasdaile for putting his geographer's hat back on to see me through this process, and providing an invaluable outside perspective. A very special thank you to Dr.Carol Hanchette, for her patient encouragement over the (many) years it has taken to reach this point. She reminded me that yes, I can do this. Thanks to Forrest Stevens for the crash course in R coding and machine learning that led to a major breakthrough that helped push me over the hump with this project. My brain still hurts. To my lovely wife Nicole, thank you for putting up with me through the deepest moments of frustration, and being a constant companion, confidante, and comedy sidekick…not just now, but always. Accurate remote-sensing based inventories of glacial ice are often hindered by the presence of supraglacial debris cover. Attempts at automated mapping of debris-covered glacier areas from remotely-sensed multispectral data have met with limited success due to the spectral similarity of supraglacial debris to nearby bedrock, moraines, and fluvial deposition features. Data-fusion approaches leveraging terrain and/or thermal data with multispectral data have yielded improved results in certain geographic regions, but remain unproven in others. This research builds on the data-fusion approaches from the literature and explores the efficacy of object-based image analysis (OBIA) and tree-based machine learning classifiers using Landsat OLI imagery and SRTM elevation data, in effort to map debris-covered glaciers in the Cordillera Blanca range of Peru. Results suggest that the OBIA and machine learning methods render advantages over traditional methods given the unique morphological settings associated with debris-covered glaciers.