| 利用改进非参数估计法的DEM误差置信区间估计 |
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| 引用本文： | 陈传法,卢秀山.利用改进非参数估计法的DEM误差置信区间估计[J].武汉大学学报(信息科学版),2011,36(11):1340-1343. |
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| 作者姓名： | 陈传法 卢秀山 |
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| 作者单位： | 山东科技大学测绘科学与工程学院,青岛市经济技术开发区前湾港路579号,266510 |
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| 基金项目： | 国家自然科学基金资助项目(41101433); 山东省“泰山学者”建设工程专项经费资助项目 |
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| 摘 要： | 为了降低误差母体分布的非正态性和较少采样数对DEM误差方差置信区间估计精度的影响,发展了改进的非参数估计法（M-NPM）。以机载激光扫描仪获取的6个不同区域的DEM数据为研究对象,基于交叉验证法分别获取了三组近似正态分布和三组非正态分布的DEM误差数据,并将其作为试验母体。从母体中随机采样,基于M-NPM获取方差置信度为95%的置信区间,借助母体进行精度验证,并与NPM结果比较。结果分析表明,当采样数小于40时,两种方法的模拟结果精度均受误差母体分布的影响,但M-NPM受影响的程度小于NPM;相比误差母体正态分布,当误差母体非正态分布时,M-NPM的估计精度明显优于NPM;无论误差母体服从何种分布,采样总量为多少,M-NPM的精度始终高于NPM,但M-NPM较高的精度是以较宽的置信区间为代价的。
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| 关 键 词： | 置信度 DEM 精度 非参数估计 |
Confidence Interval Estimation for DEM Errors Based on a Modified Non-Parameter Estimating Function |
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| CHEN Chuanfa LU Xiushan.Confidence Interval Estimation for DEM Errors Based on a Modified Non-Parameter Estimating Function[J].Geomatics and Information Science of Wuhan University,2011,36(11):1340-1343. |
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| Authors: | CHEN Chuanfa LU Xiushan |
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| Institution: | CHEN Chuanfa1 LU Xiushan1(1 Geomatics College,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266510,China) |
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| Abstract: | A modified non-parameter method(M-NPM) for the confidence interval estimation of DEM errors was developed based on NPM.Six different DEMs obtained by an airborne laser scanner were employed to comparatively analyze the accuracy of M-NPM and NPM.The six DEM error populations with three slightly non-normal and three very non-normal distributions were acquired with an across-validation process.Stochastic sampling from error populations allows us to report that when the sampling number is smaller than 40,both N... |
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| Keywords: | confidence interval DEM accuracy non-parameter estimation |
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