不同尺度DDM的深度保证率变化规律研究

Study on the Change Rule of Probability of an Adequate Depth for DDM with Different Scales

针对当前高密度多波束水深数据抽稀后所构建数字水深模型(digital depth model,DDM)的航海安全性缺少估计这一问题,分别以最浅点法、最近点法和平均值法3种常用方法抽稀水深数据并构建DDM,在此基础上,分析不同抽稀方法所构建DDM随尺度变化的深度保证率变化规律,采用统计分析的方法建立DDM深度保证率与抽稀尺度、海底地形复杂因子之间的数学回归模型。实验表明:该回归模型不仅可用于估算基于不同抽稀方法所构建DDM的深度保证率,也为确定满足适合的DDM深度保证率所需要的抽稀尺度提供了理论依据。

In viewof the problem of a lack of navigation safety estimation for digital depth model（ DDM）constructed from depth data,which is thinned from high density multi-beam bathymetric data,DDMis constructed from thinned depth data based on three commonly used methods,the shallowest point method,the nearest point method and mean value method; the change rules of probability of an adequate depth for DDMconstruction from different thinning methods with the scale change are analyzed; and a mathematical regression model is established among probability of an adequate depth of DDM,thinning scale and submarine terrain complexity factor by statistical analysis.The experimental results demonstrate that this regression model can not only be used to estimate probability of an adequate depth of DDMconstruction based on different thinning methods,but also provide a theoretical basis for determining thinning scale needed to meet the suitable probability of an adequate depth of DDM.