中國地區(qū)SRTM3 DEM與ASTER GDEM高程精度質(zhì)量評價
發(fā)布時間：2018-11-23 11:38
【摘要】：SRTM (shuttle radar topography mission) DEM,是覆蓋地球80%以上陸地表面的雷達影像數(shù)據(jù),ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) GDEM是覆蓋99%地球陸地表面的近紅外影像數(shù)據(jù),兩數(shù)據(jù)是世界上迄今為止可為用戶提供的、免費的也是最完整的全球數(shù)字高程數(shù)據(jù)。目前SRTM3DEM和ASTER GDEM數(shù)據(jù)已逐漸成為科研和應(yīng)用領(lǐng)域DEM數(shù)據(jù)的重要來源,但我國尚未有全國范圍的SRTM3DEM和ASTER GDEM高程精度質(zhì)量評價工作見諸報端。本文以我國國家基礎(chǔ)地理信息數(shù)據(jù)庫提供的1：50,000DEM為假定真值,以1:100,000DEM、1:250,000DEM為參照,提出了DEM面誤差、DEM面誤差譜的概念,提出并建立了DEM面誤差信息熵模型,通過DEM面誤差可視性分析、DEM中誤差模型、DEM面誤差信息熵模型等方法,研究分析了我國太湖地區(qū)及全國范圍的SRTM3DEM高程精度質(zhì)量和我國東部典型區(qū)ASTER GDEM的高程精度質(zhì)量,為SRTM3DEM和ASTER GDEM數(shù)據(jù)在我國范圍內(nèi)的實際引用提供堅實的理論支撐。研究結(jié)果表明： (1)太湖地區(qū)SRTM3DEM面誤差隨研究區(qū)海拔的提高和地形結(jié)構(gòu)的復(fù)雜而增大,在分級為1m的情況下,DEM面誤差圖能較好的描述太湖研究區(qū)山地地區(qū)山脊線、山谷線的走勢。通過DEM中誤差模型和DEM面誤差模型的分析,認為太湖地區(qū)SRTM3DEM高程精度質(zhì)量要高于1：250,000DEM,并低于1：100,000DEM。 (2)從全國范圍來看,SRTM3DEM數(shù)據(jù)高程精度質(zhì)量在地域上表現(xiàn)出了一定的差異性,浙江地區(qū)表現(xiàn)出了一致的SRTM3DEM數(shù)據(jù)高程精度質(zhì)量優(yōu)于1：250,000DEM的特點,而新疆、遼寧、山東、海南研究區(qū)SRTM3DEM數(shù)據(jù)高程精度質(zhì)量則表現(xiàn)出了明顯的受地形影響的特點,在平原地形研究區(qū),1：250,000DEM數(shù)據(jù)高程精度質(zhì)量要優(yōu)于SRTM3DEM;而在丘陵和山地地形研究區(qū),SRTM3DEM數(shù)據(jù)高程精度質(zhì)量則優(yōu)于1：250,000DEM。 (3)從我國東部典型區(qū)的研究結(jié)果來看,ASTER GDEM在山地和丘陵地形研究區(qū)數(shù)據(jù)高程精度質(zhì)量要高于SRTM3DEM和1：250,000DEM。研究還認為DEM面誤差在整個地圖上分布是否均勻與其高程精度質(zhì)量高低無決定關(guān)系。同時,研究過程中發(fā)現(xiàn)統(tǒng)計分析DEM面誤差的數(shù)學期望能很好的輔助DEM面誤差的可視性分析。
[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.
【學位授予單位】：華中農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P208
本文編號：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.
【學位授予單位】：華中農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P208
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