Glacier Calving Front Segmentation Using Attention U-Net

• URL: http://arxiv.org/abs/2101.03247v1
• Date: Fri, 8 Jan 2021 23:06:21 GMT
• Title: Glacier Calving Front Segmentation Using Attention U-Net
• Authors: Michael Holzmann, Amirabbas Davari, Thorsten Seehaus, Matthias Braun, Andreas Maier, Vincent Christlein
• Abstract summary: We show a method to segment the glacier calving fronts from SAR images in an end-to-end fashion using Attention U-Net. Adding attention modules to the state-of-the-art U-Net network lets us analyze the learning process by extracting its attention maps. Our proposed attention U-Net performs comparably to the standard U-Net while providing additional insight into those regions on which the network learned to focus more.
• Score: 7.64750171496838
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An essential climate variable to determine the tidewater glacier status is the location of the calving front position and the separation of seasonal variability from long-term trends. Previous studies have proposed deep learning-based methods to semi-automatically delineate the calving fronts of tidewater glaciers. They used U-Net to segment the ice and non-ice regions and extracted the calving fronts in a post-processing step. In this work, we show a method to segment the glacier calving fronts from SAR images in an end-to-end fashion using Attention U-Net. The main objective is to investigate the attention mechanism in this application. Adding attention modules to the state-of-the-art U-Net network lets us analyze the learning process by extracting its attention maps. We use these maps as a tool to search for proper hyperparameters and loss functions in order to generate higher qualitative results. Our proposed attention U-Net performs comparably to the standard U-Net while providing additional insight into those regions on which the network learned to focus more. In the best case, the attention U-Net achieves a 1.5% better Dice score compared to the canonical U-Net with a glacier front line prediction certainty of up to 237.12 meters.

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