3种高程数据的高程信息表达能力对比分析

Comparing the Ability of Elevation Information Expression among Three Kinds of Elevation Data

为了比较SRTM高程数据、Google Earth高程数据和1∶10 000比例尺地形图的高程信息表达能力,对辽宁省沈阳市部分地区的1∶10 000比例尺地形图、SRTM高程数据和Google Earth高程数据的高程信息表达能力进行了对比分析。为评价它们对地形表达的细腻程度,通过直观可视化分析高程分布、高程点数频率、高程较差、坡度和坡向、沟壑密度值等,得到它们在高程信息表达能力方面各自的优势与不足。

In this paper,topographic map in the scale of 1:10 000,SRTM elevation data and Google Earth elevation data are compared and analyzed to obtain their ability of the height information expression in some areas of Liaoning province. A variety of methods and parameters are used to appraise their degree of height expression,including visual analysis,height distribution,elevation point frequency,elevation difference,slope and slope direction,gully density value. The conclusion is that three kinds of elevation data have their own advantages and disadvantages in the elevation information expression.