基于总传播误差法构建海底地形模型

Total propagated error computation algorithm and its application in processing of multi-beam data

为了提高多波束数据处理效率,克服趋势面法、中值滤波法等对海底地形细节的损坏,采用总传播误差法进行多波束数据处理、构建海底地形模型(DTM)。研究结果表明:总传播误差法以实测数据误差计算为基础,依据IHO标准设置滤波器进行粗差自动剔除,避免了人机交互式编辑主观性判断的干扰,数据处理速度是人机交互式编辑的5倍。总传播误差法依据水深变化设置可变网格,保证了地形模型具有较高的分辨率,很好地保留了地形细节。总传播误差模型具有更强的抗差性,适合于海底热液区等复杂地形环境研究。

Total propagated error computation（TPE）algorithm is established to improve the efficiency of Multi-Beam Echo-Sounder data（MBES）processing and to avoid losing of terrain detail in trend surface model and median filter model.According to the IHO standard,TPE algorithm eliminates noises automatically based on the total propagated error computation.TPE establishes Digital Terrain Model（DTM）based on the combined estimation of the depth and related uncertainty of the MBES data.To evaluate the efficiency and quality of the TPE algorithm,TPE algorithm and man-machine editor are used respectively to process the same MBES data of Lau Basin.The data processing speed of TPE algorithm is 5 times of the man-machine editor.The TPE terrain model has much more detail than the man-machine model.It can be seen from the result that TPE algorithm is superior both in efficiency and uncertainty control and favorable for the research of complicated topography.