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Semi-automatic mapping of tidal cracks in the fast ice region near Zhongshan Station in East Antarctica using Landsat-8 OLI imagery


Hui, F and Li, X and Zhao, T and Shokr, M and Heil, P and Zhao, J and Liu, Y and Liang, S and Cheng, X, Semi-automatic mapping of tidal cracks in the fast ice region near Zhongshan Station in East Antarctica using Landsat-8 OLI imagery, Remote Sensing, 8, (3) Article 242. ISSN 2072-4292 (2016) [Refereed Article]


Copyright Statement

Copyright 2016 The Author(s)Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.3390/rs8030242


Tidal cracks are linear features that appear parallel to coastlines in fast ice regions due to the actions of periodic and non-periodic sea level oscillations. They can influence energy and heat exchange between the ocean, ice, and atmosphere, as well as human activities. In this paper, the LINE module of Geomatics 2015 software was used to automatically extract tidal cracks in fast ice regions near the Chinese Zhongshan Station in East Antarctica from Landsat-8 Operational Land Imager (OLI) data with resolutions of 15 m (panchromatic band 8) and 30 m (multispectral bands 17). The detected tidal cracks were determined based on matching between the output from the LINE module and manually-interpreted tidal cracks in OLI images. The ratio of the length of detected tidal cracks to the total length of interpreted cracks was used to evaluate the automated detection method. Results show that the vertical direction gradient is a better input to the LINE module than the top-of-atmosphere (TOA) reflectance input for estimating the presence of cracks, regardless of the examined resolution. Data with a resolution of 15 m also gives better results in crack detection than data with a resolution of 30 m. The statistics also show that, in the results from the 15-m-resolution data, the ratios in Band 8 performed best with values of the above-mentioned ratio of 50.92 and 31.38 percent using the vertical gradient and the TOA reflectance methods, respectively. On the other hand, in the results from the 30-m-resolution data, the ratios in Band 5 performed best with ratios of 47.43 and 17.8 percent using the same methods, respectively. This implies that Band 8 was better for tidal crack detection than the multispectral fusion data (Bands 17), and Band 5 with a resolution of 30 m was best among the multispectral data. The semi-automatic mapping of tidal cracks will improve the safety of vehicles travel in fast ice regimes.

Item Details

Item Type:Refereed Article
Keywords:tidal cracks, remote sensing, fast ice, semi-automated mapping, Landsat-8, sea ice
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Heil, P (Dr Petra Heil)
ID Code:113756
Year Published:2016
Web of Science® Times Cited:8
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-01-19
Last Modified:2017-10-30
Downloads:196 View Download Statistics

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