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| 采样数据密度及栅格尺寸对高程中误差的影响分析 | |
| 引用本文： | 王雷,杨勤科,王春梅,龙永清.采样数据密度及栅格尺寸对高程中误差的影响分析[J].武汉大学学报(信息科学版),2012,37(3):366-369. |
| 作者姓名： | 王雷 杨勤科 王春梅 龙永清 |
| 作者单位： | 1. 中国科学院水利部水土保持研究所,西安市西农路26号712100／西北大学城市与环境学院,西安市学府大道1号710127 2. 中国科学院水利部水土保持研究所,西安市西农路26号,712100 3. 西北大学城市与环境学院,西安市学府大道1号,710127 |
| 基金项目： | 国家自然科学基金资助项目，国家973计划资助项目，陕西省教育厅科研计划资助项目，西北大学科学研究基金资助项目 |
| 摘 要： | 利用全数字摄影测量得到的高精度点数据,获取不同密度的点数据,建立基于ANUDEM和TIN方法的两种DEM,比较两种DEM的高程中误差,分析数据密度、栅格尺寸与高程中误差的关系。研究结果表明,建立1∶100 00比例尺,具有高程中误差2m左右、栅格尺寸5m以下的ANUDEM,需要的点密度水平为大于7 000个/km2,而TINDEM则为8 500个/km2。同时,当栅格尺寸小于20m、数据密度介于7 000～9 400个/km2时,无论是ANUDEM还是TINDEM,高程中误差都处于一个较稳定的状态。 |
| 关 键 词： | 数字高程模型 数据密度 栅格尺寸 高程中误差 |
Analysis of Relationship Among RMSE of Elevation,Grid Size and Data Density when Generate DEM |
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| WANG Lei,Yang Qinke,WANG Chunmei,LONG Yongqing.Analysis of Relationship Among RMSE of Elevation,Grid Size and Data Density when Generate DEM[J].Geomatics and Information Science of Wuhan University,2012,37(3):366-369. | |
| Authors: | WANG Lei Yang Qinke WANG Chunmei LONG Yongqing |
| Institution: | 1(1 Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources, 26 Xinong Road,Xi’an 712100,China)(2 College of Urban and Environment,Northwest University,1 Xuefu Road,Xi’an 710127,China) |
| Abstract: | The resolution of digital elevation models is a basic parameter to generate DEM.However,those studies about how to decide the resolution of DEM didn’t take the points number into account.We analyze RMSE of Elevation of ANUDEM and TIN-DEM,which are generated by the data extracted from aero photos by digital photogrammetric method.The results show that the point density for building ANUDEM with 2 m RMSE of elevation and 5 m grid size should be more than 7 000 points/km2,while for TINDEM,it should be more than 8 500 points/km2 at 1∶100 00 scale level.Moreover,RMSE of elevation keeps stable when the grid size is finer than 20 m and the point density is in the range between 7 400 and 9 400 points/km2. |
| Keywords: | digital elevation models（DEM） point density grid size RMSE of elevation |
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