1. 西北大学 城市与环境学院,陕西,西安,710127
2. 中国科学院 水利部 水土保持研究所, 陕西 杨陵,712100
纸质出版:2016
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王雷, 龙永清, 杨勤科. 重采样方法对DEM数据质量的影响[J]. 水土保持通报, 2016,36(4):72-77.
WANG Lei, LONG Yongqing, YANG Qinke. Effects of Resampling Method on Data Quality of DEMs[J]. Bulletin of Soiland Water Conservation, 2016, 36(4): 72-77.
王雷, 龙永清, 杨勤科. 重采样方法对DEM数据质量的影响[J]. 水土保持通报, 2016,36(4):72-77. DOI: 10.13961/j.cnki.stbctb.2016.04.013.
WANG Lei, LONG Yongqing, YANG Qinke. Effects of Resampling Method on Data Quality of DEMs[J]. Bulletin of Soiland Water Conservation, 2016, 36(4): 72-77. DOI: 10.13961/j.cnki.stbctb.2016.04.013.
[目的] 针对在数字地形分析的实际应用问题,利用重采样方法得到的DEM数据精度,旨在分析不同的重采样方法对所获得的DEM数据质量的影响。[方法] 从数据误差的角度,以陕西省绥德县窑家湾沟流域的以全数字摄影测量得到的DEM数据为基准,计算并比较利用重采样方法得到的DEM的数据误差。[结果] 无论采用何种重采样方法,得到DEM数据质量均未得到提高,其高程误差的空间分布与重采样方法相关,地形变化剧烈的地方,误差较大;中误差的大小则取决于重采样方法与原始格网尺寸。[结论] 最近邻法得到的重采样DEM数据的中误差最高,三次立方卷积法的最小,双线性内插法则略高于三次立方卷积法。
[Objective] The influences of different resampling methods on the quality of DEMs were analyzed to explain the accuracy of those methods which were widely used in digital terrain analysis. [Methods] Based on data error analysis
the RMSEs of elevation of those DEMs were calculated from different resampling methods
and from the original DEMs generated by digital photogrammetric method in Yaojiawan valley
Suide County of Shaanxi Province Were compared. [Results] No improvement of the quality of resampled DEMs was observed for all the resampling methods. The spatial distribution of elevation error of resampled DEMs depended on the resampling methods. The larger errors emerged in the positions with the vigorous changing of surface. Meanwhile
the values of RMSE were decided by original grid size and the methods of resampling. [Conclusion] The DEMs resampled by nearest method had the highest RMSE
while the Cubic method obtained the lowest RMSE and Bilinear method got slightly higher RMSE than that of Cubic method.
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国家测绘局. GB/T7930-2008 1∶500,1∶1000,1∶2000地形图航空摄影测量内业规范[S].北京:中国标准出版社,2008.
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张祖勋.影象灰度内插的研究[J].测绘学报,1983,12(3):178-188.
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