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A new highly precise source of data has recently become available using multibeam sonar systems in hydrography. Multibeam sonar systems can provide hydrographic quality depth data as well as high-resolution seafloor sonar images. We utilize the seafloor backscatter strength data of each beam from multibeam sonar and the automatic classification technology so that we can get the seafloor type identification maps. In this article, analyzing all kinds of error effects in backscatter strength, data are based on the relationship between backscatter strength and seafloor types. We emphasize particularly analyzing the influences of local bottom slope and near nadir reflection in backscatter strength data. We also give the correction algorithms and results of these two influent factors. After processing the raw backscatter strength data and correcting error effects, we can get processed backscatter strength data which reflect the features of seafloor types only. Applying the processed backscatter strength data and mosaicked seafloor sonar images, we engage in seafloor classification and geomorphy interpretation in future research.
The authors acknowledge the assistance of the Center for Ocean Mapping and Engineering Information Research in the First Institute of Oceanography and the Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University. This research work is supported by the young grant from the State Oceanic Administration of China (Project code: 2002306), 863 Program of China (Project code: 2001AA613040), Hong Kong Polytechnic University project (Project code: G-V931) and Hong Kong RGC project (code: BQ 734).