中国地区SRTM3 DEM与ASTER GDEM高程精度质量评价
发布时间：2018-11-23 11:38
【摘要】：SRTM (shuttle radar topography mission) DEM,是覆盖地球80%以上陆地表面的雷达影像数据,ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) GDEM是覆盖99%地球陆地表面的近红外影像数据,两数据是世界上迄今为止可为用户提供的、免费的也是最完整的全球数字高程数据。目前SRTM3DEM和ASTER GDEM数据已逐渐成为科研和应用领域DEM数据的重要来源,但我国尚未有全国范围的SRTM3DEM和ASTER GDEM高程精度质量评价工作见诸报端。本文以我国国家基础地理信息数据库提供的1：50,000DEM为假定真值,以1:100,000DEM、1:250,000DEM为参照,提出了DEM面误差、DEM面误差谱的概念,提出并建立了DEM面误差信息熵模型,通过DEM面误差可视性分析、DEM中误差模型、DEM面误差信息熵模型等方法,研究分析了我国太湖地区及全国范围的SRTM3DEM高程精度质量和我国东部典型区ASTER GDEM的高程精度质量,为SRTM3DEM和ASTER GDEM数据在我国范围内的实际引用提供坚实的理论支撑。研究结果表明： (1)太湖地区SRTM3DEM面误差随研究区海拔的提高和地形结构的复杂而增大,在分级为1m的情况下,DEM面误差图能较好的描述太湖研究区山地地区山脊线、山谷线的走势。通过DEM中误差模型和DEM面误差模型的分析,认为太湖地区SRTM3DEM高程精度质量要高于1：250,000DEM,并低于1：100,000DEM。 (2)从全国范围来看,SRTM3DEM数据高程精度质量在地域上表现出了一定的差异性,浙江地区表现出了一致的SRTM3DEM数据高程精度质量优于1：250,000DEM的特点,而新疆、辽宁、山东、海南研究区SRTM3DEM数据高程精度质量则表现出了明显的受地形影响的特点,在平原地形研究区,1：250,000DEM数据高程精度质量要优于SRTM3DEM;而在丘陵和山地地形研究区,SRTM3DEM数据高程精度质量则优于1：250,000DEM。 (3)从我国东部典型区的研究结果来看,ASTER GDEM在山地和丘陵地形研究区数据高程精度质量要高于SRTM3DEM和1：250,000DEM。研究还认为DEM面误差在整个地图上分布是否均匀与其高程精度质量高低无决定关系。同时,研究过程中发现统计分析DEM面误差的数学期望能很好的辅助DEM面误差的可视性分析。
[Abstract]:SRTM (shuttle radar topography mission) DEM, is the radar image data covering more than 80% of the earth's land surface., ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) GDEM is the near infrared image data covering 99% of the earth's land surface. Two data are available to users in the world so far, free and the most complete global digital elevation data. At present, SRTM3DEM and ASTER GDEM data have gradually become an important source of DEM data in scientific research and application field, but there are no nationwide SRTM3DEM and ASTER GDEM elevation accuracy quality evaluation work in China. In this paper, the concept of DEM surface error and DEM surface error spectrum is put forward, and the entropy model of DEM surface error information is put forward, taking the 1:50000DEM provided by the national basic geographic information database as the assumed true value and 1: 100000DEM as the reference. Through the analysis of DEM surface error visibility, DEM error model and DEM surface error information entropy model, the accuracy quality of SRTM3DEM elevation in Taihu area and China and ASTER GDEM in eastern China are studied and analyzed. To provide a solid theoretical support for the actual reference of SRTM3DEM and ASTER GDEM data in our country. The results show that: (1) the error of SRTM3DEM surface in Taihu Lake area increases with the elevation of the study area and the complexity of the topographic structure. When the classification is 1m, the error map of DEM surface can well describe the ridge line in the mountainous area of Taihu Lake study area. The course of the valley line. Based on the analysis of DEM error model and DEM surface error model, it is concluded that the precision quality of SRTM3DEM elevation in Taihu area is higher than 1: 2500DEM and less than 1: 100000DEM. (2) from a national perspective, the elevation accuracy quality of SRTM3DEM data shows a certain difference in the region, Zhejiang region shows the characteristics of consistent elevation accuracy quality of SRTM3DEM data is better than 1:250000DEM, while Xinjiang, Liaoning, Shandong, Xinjiang, Liaoning, Shandong, The elevation accuracy quality of SRTM3DEM data in Hainan study area is obviously affected by topography. In plain terrain study area, the elevation accuracy quality of 1:250000DEM data is better than that of SRTM3DEM;. In hilly and mountainous terrain study areas, the elevation accuracy of SRTM3DEM data is better than that of 1: 250000DEM. (3) from the research results of typical areas in eastern China, it is found that the elevation accuracy of, ASTER GDEM in mountainous and hilly terrain study areas is higher than that of SRTM3DEM and 1: 2500DEM. It is also considered that there is no relationship between the distribution of DEM surface errors on the whole map and the elevation accuracy and quality. At the same time, it is found that the mathematical expectation of statistical analysis of DEM surface error can well assist the visibility analysis of DEM surface error.
【学位授予单位】：华中农业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208
本文编号：2351469
[Abstract]:SRTM (shuttle radar topography mission) DEM, is the radar image data covering more than 80% of the earth's land surface., ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) GDEM is the near infrared image data covering 99% of the earth's land surface. Two data are available to users in the world so far, free and the most complete global digital elevation data. At present, SRTM3DEM and ASTER GDEM data have gradually become an important source of DEM data in scientific research and application field, but there are no nationwide SRTM3DEM and ASTER GDEM elevation accuracy quality evaluation work in China. In this paper, the concept of DEM surface error and DEM surface error spectrum is put forward, and the entropy model of DEM surface error information is put forward, taking the 1:50000DEM provided by the national basic geographic information database as the assumed true value and 1: 100000DEM as the reference. Through the analysis of DEM surface error visibility, DEM error model and DEM surface error information entropy model, the accuracy quality of SRTM3DEM elevation in Taihu area and China and ASTER GDEM in eastern China are studied and analyzed. To provide a solid theoretical support for the actual reference of SRTM3DEM and ASTER GDEM data in our country. The results show that: (1) the error of SRTM3DEM surface in Taihu Lake area increases with the elevation of the study area and the complexity of the topographic structure. When the classification is 1m, the error map of DEM surface can well describe the ridge line in the mountainous area of Taihu Lake study area. The course of the valley line. Based on the analysis of DEM error model and DEM surface error model, it is concluded that the precision quality of SRTM3DEM elevation in Taihu area is higher than 1: 2500DEM and less than 1: 100000DEM. (2) from a national perspective, the elevation accuracy quality of SRTM3DEM data shows a certain difference in the region, Zhejiang region shows the characteristics of consistent elevation accuracy quality of SRTM3DEM data is better than 1:250000DEM, while Xinjiang, Liaoning, Shandong, Xinjiang, Liaoning, Shandong, The elevation accuracy quality of SRTM3DEM data in Hainan study area is obviously affected by topography. In plain terrain study area, the elevation accuracy quality of 1:250000DEM data is better than that of SRTM3DEM;. In hilly and mountainous terrain study areas, the elevation accuracy of SRTM3DEM data is better than that of 1: 250000DEM. (3) from the research results of typical areas in eastern China, it is found that the elevation accuracy of, ASTER GDEM in mountainous and hilly terrain study areas is higher than that of SRTM3DEM and 1: 2500DEM. It is also considered that there is no relationship between the distribution of DEM surface errors on the whole map and the elevation accuracy and quality. At the same time, it is found that the mathematical expectation of statistical analysis of DEM surface error can well assist the visibility analysis of DEM surface error.
【学位授予单位】：华中农业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208
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