基于Memoryless算法的河道水下地形模型简化研究

Research on the Simplification of Riverway Underwater Terrain Model Based on Memoryless Algorithm

模型简化技术能有效缓解海量数据分析与计算机资源不足之间的矛盾。首先根据河道水下地形模型的实际情况,对Memoryless算法进行了改进,使得简化后的模型能更好地规避狭长三角形;然后根据水文分析理论,在改进Memoryless简化算法中增加河道地性线约束,使得河道地形在地性线周围区域的细节能够得到较好的保持;最后通过两组不同来源的数据进行不同简化比率下的简化实验。结果表明,简化后的地形模型效果良好,误差在可接受范围内,并较好地保持了河道地形的几何细节特征。

Model simplification technology can effectively ease the contradiction between huge date analysis and insufficient computer resources.Firstly,according to the actual situation of underwater topographical data,we improved Memoryless algorithm,which could avoid long and narrow triangle.And then,based on the hydrological theory,we increased the constraint of terrain structure line into the simplified model,which could keep details better.Finally,we used two groups of different data sources to do the simplified experiment which under different ratio.The results show that the simplified terrain model works successfully,and keeps the geometric features and details of river.