高分辨率卫星立体双介质浅水水深测量方法

提出了一种基于高分辨率卫星多光谱立体像对的浅水水深测量方法。该方法利用多光谱近红波段消除太阳耀斑,以有理函数模型(RFM)构建测区原始DEM,通过水陆边界内插获得水面高程,并采用双介质近似折射改正模型消除目标点垂直坐标偏移。试验表明,本文的模型方法和处理流程在水面平静、底质纹理丰富的浅海岛礁水深反演中能取得优于20%的相对测深精度,可为浅水水深测量提供新手段。

Shal low Water Bathymetry through Two-medium Photogrammetry Using High Resolution Satellite Imagery

This paper develops an automated shallow water bathymetry procedure based on two-medium photogrammetry using high resolution satellite multispectral imagery.In this method,near-infrared band were used for sunglint elimination and rational function model (RFM)was applied for raw DEMgeneration. By extracting the water-land edge and interpolating edge elevation,water surface position could be determined.An approximation refraction correction model,in which all homonymy lights were regarded as intersect to the same observed point,was adopted to correct the vertical offsets.Experimental results indicate that DEM accuracy of satellite two-medium photogrammetry is better than 20% of the average depth under the circumstance of relatively calm water and rich bottom texture.