一种用于海洋层化数据的插值方法改进

海洋环境调查数据的客观分析图像是调查结果的直观体现,也是进一步科学研究的基础。在环境要素空间分布复杂的近海海域及陆架坡区,我们发现利用现有插值方法得到的结果有时会出现之前没有被关注到的局部异常,如常用的Kriging方法或三角网线性插值方法插值得到的图像有时会出现或轻或重的"藕"状或"台阶"状的层化结构异常。本文提出一种针对原始数据采用坐标变换方法,并联合使用三角网线性插值法和Kriging法两种方法进行数据插值,从而有效地避免了类似"藕"状或"台阶"状的层化结构假象,解决了插值方法在海洋环境调查数据插值过程中遇到的一个实际问题,也是对现有插值方法的一种补充。

IMPROVED INTERPOLATION FOR MARINE STRATIFICATION DATA

The objective analysis images of marine environmental survey data are a direct reflection of the survey results and the basis for further scientific research. In the offshore waters and continental shelf slopes where the spatial distribution of environmental elements is complex, we find that the results obtained by the existing interpolation methods sometimes show local anomalies that have not been noticed before, such as the commonly used Kriging method or triangulation linear interpolation method. The image sometimes appears to have a light or heavy lotus-root-like or stairway-like layered structure abnormality. We proposed a coordinate transformation method based on the original data, and uses a combination of triangulation linear interpolation and Kriging to perform data interpolation, thereby effectively avoiding the artifacts of a layered structure similar to lotus-root or stairway in shape. The method solves a practical problem encountered in the interpolation of marine environmental survey data by interpolation methods, and is a supplement to the existing interpolation methods.