利用多波段卫星数据进行浅海水深反演方法研究

以遥感反演水深的基本原理为基础,利用我国南海永暑礁景区的TM数据和实测水深资料,通过TM多波段数据辐射校正、图像与海图地理配推、底质类型分区、潮汐改正和实测水深数据与相应的图像辐射值回归分析,建立了浅海水深反演模型,并进行了浅海岛礁水深的实际计算,总标准误差为2．14m。对我国南海30m以浅岛礁水深地形研究有很好的应用价值。

A Technique for Extracting Water Depth Information from Multispectral Scanner Data in the South China Sea

:In the present study, A technique had been developed for shallow water bathymetry based on the simple shallow-water radiance model optically. First, the information of bottom types was extracted by analyzing multispectral character of remote sensing images for some well-known points in the seamap. Second, on the basis of the identification of coral stone and sand, Logarithmic values of image calibration brightness are selected from the imagery for locations of the water depth measurements and two regression curve are established. The method that is proposed has been used for extracting water depth in other areas on imagery from the same limpid environment.The results indicate the total standard deviation of depth error is 2.14 m. The study results can be applied to shallow water depths calculation and bathymetric mapping in South China Sea.