Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier

Beitrag in einer Fachzeitschrift
(Online-Publikation)


Details zur Publikation

Autorinnen und Autoren: Lippl S, Vijay S, Braun M
Zeitschrift: Journal of Glaciology
Verlag: Cambridge University Press
Jahr der Veröffentlichung: 2018
Seitenbereich: 1–11
ISSN: 0022-1430
Sprache: Englisch


Abstract

Despite their importance for mass-balance estimates and the progress in
techniques based on optical and thermal satellite imagery, the mapping
of debris-covered glacier boundaries remains a challenging task. Manual
corrections hamper regular updates. In this study, we present an
automatic approach to delineate glacier outlines using
interferometrically derived synthetic aperture radar (InSAR) coherence,
slope and morphological operations. InSAR coherence detects the
temporally decorrelated surface (e.g. glacial extent) irrespective of
its surface type and separates it from the highly coherent surrounding
areas. We tested the impact of different processing settings, for
example resolution, coherence window size and topographic phase removal,
on the quality of the generated outlines. We found minor influence of
the topographic phase, but a combination of strong multi-looking during
interferogram generation and additional averaging during coherence
estimation strongly deteriorated the coherence at the glacier edges. We
analysed the performance of X-, C- and L- band radar data. The C-band
Sentinel-1 data outlined the glacier boundary with the least
misclassifications and a type II error of 0.47%
compared with Global Land Ice Measurements from Space inventory data.
Our study shows the potential of the Sentinel-1 mission together with
our automatic processing chain to provide regular updates for
land-terminating glaciers on a large scale.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Braun, Matthias Prof. Dr.
Professur für Geographie (Fernerkundung und GIS)
Lippl, Stefan
Institut für Geographie
Vijay, Saurabh
Institut für Geographie


Zitierweisen

APA:
Lippl, S., Vijay, S., & Braun, M. (2018). Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier. Journal of Glaciology, 1–11. https://dx.doi.org/10.1017/jog.2018.70

MLA:
Lippl, Stefan, Saurabh Vijay, and Matthias Braun. "Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier." Journal of Glaciology (2018): 1–11.

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