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Open AccessArticle

Offshore Platform Extraction Using RadarSat-2 SAR Imagery: A Two-Parameter CFAR Method Based on Maximum Entropy

by Qi Wang 1, Jing Zhang 1,2,3 and Fenzhen Su 1,*
1
State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China
2
Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China
3
Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, 88 Anning Rd., Lanzhou 730070, China
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(6), 556; https://doi.org/10.3390/e21060556
Received: 27 February 2019 / Revised: 17 May 2019 / Accepted: 28 May 2019 / Published: 2 June 2019
(This article belongs to the Special Issue Entropy Applications in Environmental and Water Engineering II)
The ability to determine the number and location of offshore platforms is of great significance for offshore oil spill monitoring and offshore oil and gas development. Considering the problem that the detection threshold parameters of the two-parameter constant false alarm rate (CFAR) algorithm require manual and repeated adjustment of the during the extraction of offshore platform targets, this paper proposes a two-parameter CFAR target detection method based on maximum entropy based on information entropy theory. First, a series of threshold parameters are obtained using the two-parameter CFAR algorithm for target detection. Then, according to the maximum entropy principle, the optimal threshold is estimated to obtain the target detection results of the possible offshore platform. Finally, the neighborhood analysis method is used to eliminate false alarm targets such as ships, and the final target of the offshore platform is obtained. In this study, we conducted offshore platform extraction experiments and an accuracy evaluation using data from the Pearl River Estuary Basin of the South China Sea. The results show that the proposed method for platform extraction achieves an accuracy rate of 97.5% and obtains the ideal offshore platform distribution information. Thus, the proposed method can objectively obtain the optimal target detection threshold parameters, greatly reduce the influence of subjective parameter setting on the extraction results during the target detection process and effectively extract offshore platform targets. View Full-Text
Keywords: offshore platform extraction; two-parameter CFAR; maximum entropy; Pearl River Estuary Basin offshore platform extraction; two-parameter CFAR; maximum entropy; Pearl River Estuary Basin
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Wang, Q.; Zhang, J.; Su, F. Offshore Platform Extraction Using RadarSat-2 SAR Imagery: A Two-Parameter CFAR Method Based on Maximum Entropy. Entropy 2019, 21, 556.

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