EGU2020-21811
https://doi.org/10.5194/egusphere-egu2020-21811
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Enhancing alpine glacial lakes detection and mapping using multi-source data and machine learning techniques

Sonam Wangchuk and Tobias Bolch
Sonam Wangchuk and Tobias Bolch
  • University of St Andrews, Department of Geography and Sustainable Development, St Andrews, United Kingdom of Great Britain and Northern Ireland (sw274@st-andrews.ac.uk)

An accurate detection and mapping of glacial lakes in the Alpine regions such as the Himalayas, the Alps and the Andes are challenged by many factors. These factors include 1) a small size of glacial lakes, 2) cloud cover in optical satellite images, 3) cast shadows from mountains and clouds, 4) seasonal snow in satellite images, 5) varying degree of turbidity amongst glacial lakes, and 6) frozen glacial lake surface. In our study, we propose a fully automated approach, that overcomes most of the above mentioned challenges, to detect and map glacial lakes accurately using multi-source data and machine learning techniques such as the random forest classifier algorithm. The multi-source data are from the Sentinel-1 Synthetic Aperture Radar data (radar backscatter), the Sentinel-2 multispectral instrument data (NDWI), and the SRTM digital elevation model (slope). We use these data as inputs for the rule-based segmentation of potential glacial lakes, where decision rules are implemented from the expert system. The potential glacial lake polygons are then classified either as glacial lakes or non-glacial lakes by the trained and tested random forest classifier algorithm. The performance of the method was assessed in eight test sites located across the Alpine regions (e.g. the Boshula mountain range and Koshi basin in the Himalayas, the Tajiks Pamirs, the Swiss Alps and the Peruvian Andes) of the word. We show that the proposed method performs efficiently irrespective of geographic, geologic, climatic, and glacial lake conditions.

How to cite: Wangchuk, S. and Bolch, T.: Enhancing alpine glacial lakes detection and mapping using multi-source data and machine learning techniques, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-21811, https://doi.org/10.5194/egusphere-egu2020-21811, 2020

This abstract will not be presented.