Handling Uncertainty in Underwater Terrain during Dredging by Using Filled-Matrix Algorithms

Lihua Wang 1, Yimin Shi 1, Jun Wan 2 and Wei Chen 1+ 
1 Dept. of Surveying and Geo-informatics, Tongji University 1239, Siping Rd, Shanghai, 200092, China 
2 Shanghai Dahua Surveying & Mapping Co., Ltd, N0.2501, Pudong Avenue, Shanghai, 200136, China 

Abstract. This paper brings up a new method to build the underwater terrain which uses filled matrix to represent the terrain so as to resolve the problem of difficult updating the changing underwater terrain in real time during construction. By the filled-matrix, the underwater constructing terrain will be represented real- timely, so as to get constructing condition and avoid superfluous phenomena. Firstly, the paper tells the definition of filled-matrix and how to build the filled-matrix terrain model on the conventional DEM method. Secondly, the authors analyze the underwater terrain uncertainty during constructing and the necessary for resolving the uncertainty. Thirdly, the authors discuss the updating arithmetic for filled-matrix terrain. Finally the paper tells the application of using updating filled-matrix terrain during dredging to get real-time terrain modeling for supervising.

Keywords: filled-matrix, underwater terrain, uncertainty, update

In: Wan, Y. et al. (eds) Proceeding of the 8th international symposium on spatial accuracy assessment in natural resources and environmental sciences, World Academic Union (Press).

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