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Review on global digital elevation products

  • role： First author第一作者
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

  • Email：tangxinming99@qq.com
  • Introduction：唐新明，1966年生，男，研究员，研究方向为摄影测量与航天测绘的研究与应用。E-mail: tangxinming99@qq.com
TANG Xinming1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

    School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

  • Email：Shijin_Li@cumt.edu.cn
  • Introduction：李世金，1995年生，男，博士研究生，研究方向为InSAR数据处理与应用。E-mail: Shijin_Li@cumt.edu.cn
LI Shijin12*,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

LI Tao1,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

    School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

GAO Yandong12,  
  • Affiliation：

    School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

ZHANG Shubi2,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

CHEN Qianfu1,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of the People's Republic of China, Beijing 100048, China

ZHANG Xiang1

résumé

Digital elevation products are the digital expression of terrain and elevation information, which has been widely utilized in the fields of climate, meteorology, topography, geological disasters, soil, and hydrology. Meanwhile, the development of information and digitalization all over the world and the research of major global issues have emphasized the increasingly becoming important role of high-precision and -resolution global digital elevation products. Therefore, the public free digital elevation products are comprehensively described and analyzed in this study to facilitate different users to select appropriate data products depending on their personal requirements.This study first discusses the different measurement indexes of digital elevation products’ accuracy. Moreover, the equivalence relationship between the common measurement indexes is derived to compare and analyze different digital elevation products. The global elevation data acquisition modes are explored first. The main properties and characteristics of ETOPO, GTOPO30, GMTED2010, ASTER GDEM, AW3D30, SRTM, and TanDEM-X DEM global data products are introduced in detail through the initial data fusion and the subsequent global mapping based on optical stereo photogrammetry and interferometric synthetic aperture radar techniques. The development history of different products is also briefly described. The parameters and elevation accuracy among the aforementioned digital elevation products are then summarized and comparatively analyzed. The results are shown in Table 7 and 8, respectively.On this basis, the different data products under 1″ and 3″ resolution for a mountain located in Wuzhong City, Ningxia Hui Autonomous Region are analyzed in detail by means of qualitative and quantitative comparison. The visual analysis shows that the AW3D30 and ASTER DEM products exhibit the relatively rich landform detail features, and they are both superior to the SRTM and TanDEM-X DEM elevation products. However, the particle effects obviously appear in the ASTER GDEM products, and the precision of these products is low. Among these products, the TanDEM-X DEM products are relatively smooth because they are derived by resampling the high- resolution products. In terms of elevation accuracy, TanDEM-X DEM products have the highest accuracy and are followed by AW3D30 and SRTM products. These products are greatly superior to the global digital elevation products obtained by multi-source data fusion. The quantitative difference analysis results of different products are consistent with the conclusion mentioned above.In general, adopting the advanced satellite remote sensing technology to obtain elevation data with uniform data source, quality, and precision will be the development trend of global digital elevation products. Furthermore, the application field of digital elevation products with high precision and resolution obtained by advanced techniques will be expanded from the initial change research of global large area to the application research related to elevation of urban and even local small area. Therefore, domestic digital elevation products, which can be controlled independently, are urgently demanded. Meanwhile, the popular domestic LuTan-1 SAR satellite with the interference as main task will soon be launched, and it will provide a good technical foundation for the production and acquisition of domestic global digital elevation products.

mots-clés

global digital elevation product;optical stereo photogrammetry;InSAR;digital elevation product’s accuracy

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