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在玛尔挡地区格网DEM的数据上选择实验样区,以不同分辨率情况下DEM数据对地表模拟表达的逼近程度为研究对象,最优逼近时的栅格单元大小的临界值就是所求的最佳分辨率。在分析坡度中误差法和公式法等常见方法的基础上,借鉴坡度中误差的思想,选取区域地形粗糙度K、剖面线长度SL两个定量指标来综合分析确定该地区格网DEM的最佳分辨率。在ArcGIS平台上对方法进行了实验验证,得出分别以2m和8m作为玛尔挡地区1∶10 000和1∶50 000 DEM生产时是最佳分辨率的结论。研究表明这种解决办法不仅可以克服GIS空间分析中DEM分辨率确定的盲目性和随意性,而且能确保基于DEM的各种空间分析的精度,为相关研究提供重要的参考价值。
The experimental sample is selected on the data of the grid DEM in the Malblock area, and the degree of approximation of the DEM data to the surface simulation expression under different resolutions is taken as the research object. The critical value of the grid cell size at the optimal approximation is The best resolution Based on the analysis of common methods such as the error method and the formula method in slope, and by referring to the idea of error in slope, two quantitative indexes of regional topography roughness K and section line length SL are selected for comprehensive analysis to determine the best DEM in this area Resolution. The method was validated on the ArcGIS platform and the conclusion was obtained that the best resolutions were 1:10 000 and 1:50 000 DEM for 2m and 8m respectively. The research shows that this solution can not only overcome the blindness and arbitrariness of DEM resolution determination in GIS spatial analysis, but also ensure the accuracy of various spatial analysis based on DEM and provide important reference value for related research.