Abstract
East Sea is a defined as a highly complex tidal area, thus it is difficult to calculate and determi-ne the standard surfaces for processing depth measurement data. At present, the average elevation of sea surface and sea surface is calcullated based on the tidal data with minimum monitoring time of 30 days and each station is only effective in the range of 35 to 70 km depending on the tidal featu-res of each sea area. This article presents the results of the model of the average and the lowest sea levels in the sea area of Vietnam, as a basis for referring the depth measurements of the seafloor to serve the construction of marine geographic information and making of charters to ensure maritime safety.
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