DEM格网范围检查算法探讨

DEM Grid Scope Check Algorithm

格网范围检查是DEM质量检查中不可缺少的一项，但目前的检查方式大多为半自动检查，一定程度上影响了检查效率。除此之外，格网范围检查虽然在标准上有具体的公式，但在实际检查中仍存在较大的不确定性。本文通过分析生产和质检部门的实际检查方式，结合具体的标准研究，总结了DEM格网范围检查的具体流程并程序实现；对于地理国情普查生产技术规定和测绘行业标准中关于DEM格网范围的不同计算公式问的转换进行推导，获得了一致的结果；最后提出了格网范围检查的粗查方法以提高检查效率。本文为生产和质检部门依照标准进行DEM格网范围的检查，提供了参考和指导。

Grid scope check is an essential part in DEM quality check. While most of the current check methods are pro- cessed in semi - automatic ways, which, to some extent, influence the efficiency of DEM check. Besides, the grid scope check remains lots of uncertainties in practical works although it has specific formulas in standards. Therefore, the paper summarizes the detailed flow of DEM grid scope check and realizes it by analyzing the practical check methods of production and quality check department combined with detailed standards study. Moreover, the authors deduce the conversion between the different formulas of DEM grid scope in the geographical conditions census technique rules and surveying standards, and achieve the same results. Finally, the paper raises a rough method of DEM grid scope check in order to improve the efficiency of DEM quality check in practical works. This paper provides guidance for the production and quality check department in DEM grid scope check accord- ing to standards.