一种基于行列法离散点边界搜索算法*

平面上构建离散点的边界在地理信息系统(GIS)中应用广泛，提出了基于行列法的平面离散点边界搜索的新算法，目的是解决平面离散点边界问题，通过确定步长大小，按步长对离散点分别进行行搜索和列搜索，得到离散点的边界曲线，介绍了行列边界算法的基本思想和实现过程。该算法能够正确地搜索包含凹凸特征的离散点边界，与传统边界生成算法相比，它具有通用、实现简单等特点。该算法在油田GIS领域边界划分中得到了很好的应用，能够准确地构建油田边界。

Boundary searching algorithm for discrete points based on rows and columns method

This paper proposed a novel signal notch method based on structure Hankel matrix and SVD by adding a guide signal. Used the original signal to structure Hankel matrix, the frequency components of the signal could correspond to certain singular values after the SVD transformation, and proposed a method to add a certain frequency signal to make the component become the principal one, then could eliminate the certain frequency component by removing the corresponding singular values. Lastly, achieved a good effect when used the method to process 50 Hz frequency trap of the MEG signal, and the method is not affected by the traditional filter notch deeper the more bandwidth restriction.