Raster DEM grid search method is to obtain the riverbed thalweg through a two-dimensional matrix search with a certain height rules.
栅格DEM搜索法是通过二维高程矩阵按照一定规则进行搜索，获取河床深泓线；
By slightly adjusting the optimized separation conditions using grid search method, the separation performance can be further improved.
通过扫描的方法对优化得到的分离条件进行微调，能够进一步提高分离效果。
Based on Z curve, the paper presents a method of grid partition, a procedure of partitioning search region, and a high-dimensional spatial range query algorithm.
利用Z曲线聚类和降维特性，本文给出网格划分方法、搜索区域分解过程，提出一种高维空间范围查询算法。
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