基于WorldView-2数据的西沙群岛遥感水深反演——以赵述岛和南岛为例

Remote sensing bathymetric inversion for the Xisha Islands based on WorldView-2 data: A case study of Zhaoshu Island and South Island

利用World View-2卫星数据,对西沙群岛的赵述岛和南岛开展了水深反演。以赵述岛为实验区,分析水深与各波段及波段组合的相关性,将水深相关性最大的海岸波段与绿光波段组合作为水深反演因子,建立多种回归拟合模型;将反演结果与实测水深误差对比,确定最佳拟合方式;最后,将该模型应用到南岛,反演其水深等值线图,并将其与南岛实测水深点相较。结果表明,南岛整体水深反演均方根误差在1.25 m以内。

Taking the WorldView - 2 satellite data as sources, the author carried out depth study in the Xisha Islands, with the Zhaoshu Island and the South Island as test areas. The author first analyzed the correlation between the measured water depth and each band and then chose the most relevant band and band combination. It is shown that the coast band with green band ratio is the ideal combination for water depth extraction. Based on varying regression fitting analysis, the author determined the best fitting way that could achieve the best fitting precision in comparison with the real survey depth. At last, the model was used to conduct depth inversion of the South Island, and it is shown that water depth inversion root mean square error is less than 1.5 m, and the biggest relative error is within 0.26 m.