规则格网DEM自动综合方法的评价

Evaluation of Regular-Grid DEM Generalization Methods

介绍了规则格网DEM自动综合方法的评价策略,应用4种常用自动综合方法对同一区域1∶5万DEM进行了综合处理,生成了1∶25万DEM数据。从高程值分布、派生坡度情况以及反生等高线叠置比较这3个方面对综合结果进行了评价,并分析了各综合方法影响结果精度的主要原因。实验表明,结构化综合方法具有较高的精度。

Evaluation strategies of terrain generalization approaches for regular-grid DEM data were introduced firstly. Four kinds of generalization methods were used to generalize the same region of DEM data separately, which the scale of DEM was changed from 1：50 000 to 1：250000. And then the generalized results were evaluated in three areas： elevation distribution, derivative slopes and contours＇ overlay analysis. The factors about how these methods affected the precision of the generalization results were also analyzed. Lastly the structured generalization method was considered to be the best method with the highest precision of these four kinds of regular-grid DEM generalization methods.