《Table 2 Information on maritime charts in this study[14]》

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《越南侵占中国南沙群岛岛礁数据集》

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Sea bed morphology was based on interpolation of water depths and isobaths extracted from 11charts（Table 2）by ArcGIS 10.1，in Mercator projection and CGCS 2000 coordinate system.Precise proportion of islands and reefs，and occupied date were from the literature[12–13].