A new mapping method of underwater bottom topography in the shallow sea by using SAR images

Juan Wang; Huaguo Zhang; Jingsong Yang; Lin Ren; Xiaozhen Wang

doi:10.1117/12.2241764

19 October 2016 A new mapping method of underwater bottom topography in the shallow sea by using SAR images

Juan Wang, Huaguo Zhang, Jingsong Yang, Lin Ren, Xiaozhen Wang

Proceedings Volume 9999, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016; 99991C (2016) https://doi.org/10.1117/12.2241764
Event: SPIE Remote Sensing, 2016, Edinburgh, United Kingdom

Abstract

Synthetic aperture radar (SAR) is an active instrument which is used to create images of an object. Underwater bottom topography can be retrieved indirectly by measuring variations of the sea surface roughness in the SAR images, although the microwaves cannot penetrate into the water. In this paper, we present a new simple method for bathymetric mapping in the shallow sea. Based on the radiometric correction, sea surface roughness is derived using SAR images. These results are then used for water depth inversions based on the Alpers-Hennings (AH) model, supported by a few true depth data points (sounding data or chart data). This method is used to bathymetric mapping of two areas in the Subei shoal. The study results of the two cases show that the trend of the inversion and true depths match well. The retrieval accuracy depends on the true depth data points. In a case, the true depth data is the sounding data, the relative errors between the inversion and true depths is less than 20%. In the other case, the true depth data is the chart data. And the result is worse, because the measure time of the chart is 1979, and the time of SAR images are 2000s. The bottom topography was changed. The proposed method has two advantages in that it does not require environmental parameters and it is relatively simple to operate.

Citation Download Citation

Juan Wang, Huaguo Zhang, Jingsong Yang, Lin Ren, and Xiaozhen Wang "A new mapping method of underwater bottom topography in the shallow sea by using SAR images", Proc. SPIE 9999, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016, 99991C (19 October 2016); https://doi.org/10.1117/12.2241764

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KEYWORDS

Synthetic aperture radar

Data modeling

Surface roughness

3D modeling

Optical coherence tomography

Backscatter

Microwave radiation

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