Application of the Model of Universal Gravity to Oceanic Front Detection Near the Kuroshio Front

  • 1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China;
    2. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    3. Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, CAS, Yantai 264003, China

Received date: 2012-11-19

  Revised date: 2013-01-07

  Online published: 2013-04-18


Oceanic front is a narrow transitional zone that the penetration of sea is obviously different between two or more waters there, and it plays an important role in the national production, national defense, marine and weather. Based on the modified theory of universal gravity, sea surface temperature (SST) data near the Kuroshio front are used for front detection. The theory of universal gravity assumes that each image pixel is a celestial body with a mass represented by its value. According to the law of universal gravity, the forces of the pixels in the 3 × 3 neighbourhood exerted on the central pixels can be calculated. Because fronts are susceptible to the noise and intense of fronts are commonly low, a modified method are proposed to solve these problems in this article. This method firstly eliminates the pixels that values equal to 0. Then in order to decrease the reliance on the brightness level of original data, a normalization step is applied to each 3×3 neighbourhood and next based on image enhancement function, each normalized 3×3 area can be enhanced. Finally, the theory of universal gravity is applied to enhanced data for front detection. The algorithm was tested and compared with conventional methods using in the fronts detection such as Sobel, Jensen-Shannon. The results show that compared to conventional methods in some areas, the proposed algorithm can decrease noise while not cause fronts discontinuous.

Cite this article

BENG Bo, SU Fen-Zhen, DU Yun-Yan, MENG Yun-Shan, SU Wei-Guang . Application of the Model of Universal Gravity to Oceanic Front Detection Near the Kuroshio Front[J]. Journal of Geo-information Science, 2013 , 15(2) : 187 -192 . DOI: 10.3724/SP.J.1047.2013.00187


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