用回放等高线评估DEM精度的研究

DEM回放等高线并与原始等高线进行对比分析是一种客观准确、形象直观的DEM精度评估方法。在分析已有DEM精度评估指标的基础上,提出用回放等高线水平偏移度和重要地性线回放偏移误差两个指标来评估DEM精度。基于1:5万DEM数据,详细描述了基于回放等高线的DEM精度评估方法的实现过程和步骤,包括原始等高线与回放等高线的几何匹配和各精度评估指标的计算。这一成果为DEM精度评估提供了借鉴方法,对于进一步完善DEM精度评估体系具有重要的理论指导意义和实际应用价值。

Evaluating DEM Accuracy Based on Reconstructed Contours

The method of reconstructing contours through DEM and contrasting them with original contours is the impersonal,exact,visual and intuitive one for DEM accuracy evaluation.Based on analyzed existing DEM accuracy evaluation indexes,two indexes were used to evaluate DEM accuracy,which were level offset degree of reconstructed contours and offset error of reconstructed important orographic character lines.The process and method of evaluating DEM accuracy were explicated based on reconstructed contours in detail...