| 格网DEM上径流长度计算误差的定量分析 |
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| 引用本文： | 刘学军,晋蓓,胡加佩,马锦绢.格网DEM上径流长度计算误差的定量分析[J].武汉大学学报(信息科学版),2012,37(7):757-761,779. |
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| 作者姓名： | 刘学军 晋蓓 胡加佩 马锦绢 |
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| 作者单位： | 南京师范大学虚拟地理环境教育部重点实验室,南京市栖霞区文苑路1号,210046 南京师范大学地理科学学院,南京市栖霞区文苑路1号,210046 |
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| 基金项目： | 国家自然科学基金资助项目，国家教育部博士点基金资助项目，江苏省普通高校研究生科研创新计划资助项目，南京师范大学研究生科研创新计划资助项目 |
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| 摘 要： | 基于格网DEM的径流长度的计算误差主要来源于DEM数据和流径提取算法。通过数据独立的误差分析方法,定量分析流径提取算法模型产生的误差。首先选取5种数学曲面作为模拟DEM数据源,计算出径流长度,以由曲面公式推导的径流长度公式计算的径流长度作为理论真值,通过两者的对比,分析误差及其空间分布。结果表明,汇水区的径流长度计算精度明显高于分水区;分水区的径流长度含有一定的系统误差。
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| 关 键 词： | 格网DEM 径流长度 误差 定量分析 |
Quantitative Analysis of Error in Extracting Flow Length from Grid-based Digital Elevation Model |
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| LIU Xuejun,JIN Bei,HU Jiapei,MA Jinjuan.Quantitative Analysis of Error in Extracting Flow Length from Grid-based Digital Elevation Model[J].Geomatics and Information Science of Wuhan University,2012,37(7):757-761,779. |
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| Authors: | LIU Xuejun JIN Bei HU Jiapei MA Jinjuan |
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| Institution: | 1(1 Key Laboratory of Virtual Geographic Environment,Ministry of Education, Nanjing Normal University,1 Wenyuan Road,Nanjing 210046,China)(2 School of Geography Science,Nanjing Normal University,1 Wenyuan Road,Nanjing 210046,China) |
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| Abstract: | As one of the most important variables of topography,the quality of extracting flow length has a serious effect on soil and water conservation,soil erosion and environmental assessment studies.The error of extracting flow length from grid-based Digital Elevation Model is mainly from original DEM and extracting algorithm.Based on the principle of data independent DEM interpretation analysis method,this paper quantitatively studies the error spatial distribution of flow length which is extracted from grid-based Digital Elevation Model.The result shows that the direct calculation algorithm,which is widely used,has a better effect on the calculation of the catchment area than the valley area,and at the water outlet the error achieves its maximum;flow length of the valley area contains some system error. |
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| Keywords: | grid-based digital elevation model flow length error quantitative analysis |
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