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Sensors (Basel). 2019 Jan 9;19(2). pii: E231. doi: 10.3390/s19020231.

Automatic Extraction of Offshore Platforms in Single SAR Images Based on a Dual-Step-Modified Model.

Zhang J1,2,3, Wang Q4, Su F5.

Author information

1
Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China. zhangj@lreis.ac.cn.
2
State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China. zhangj@lreis.ac.cn.
3
Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, 88 Anning Rd., Lanzhou 730070, China. zhangj@lreis.ac.cn.
4
State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China. wangqi@lreis.ac.cn.
5
State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China. sufz@lreis.ac.cn.

Abstract

The quantity and location of offshore platforms are of great significance for marine oil spill monitoring and offshore oil-gas development. In the past, multiphase medium- and low-resolution optical or radar images have been used to remove the interference of ship targets based on the static position of a platform to extract the offshore platform, resulting in large demands and high image data costs. According to the difference in shape between offshore platforms (not elongated) and ships (elongated shapes) in SAR (synthetic aperture radar) images, this paper proposes an automatic extraction method for offshore platforms in single SAR images based on a dual-step-modified model. First, the two-parameter CFAR (constant false alarm rate) algorithm was used to detect the possible offshore platform targets; then, the Hough transform was introduced to detect and eliminate ship targets with linear structures. Finally, the final offshore platform was obtained. Experiments were carried out in four study areas in the Beibu Gulf basin and the Pearl River estuary basin in the northern South China Sea. The results show that the method has a good extraction effect in the above research area, and the extraction accuracy rate of offshore platforms is 86.75%. A single SAR image can obtain satisfactory extraction results, which greatly saves on image data cost.

KEYWORDS:

Hough transform; dual-step-modified model; offshore platform; single SAR image; two-parameter CFAR detection

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