| 中国区域TanDEM-X 90 m DEM高程精度评价及其适用性分析 |
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| 引用本文： | 於佳宁,刘凯,张冰玥,黄滢,范晨雨,宋春桥,汤国安.中国区域TanDEM-X 90 m DEM高程精度评价及其适用性分析[J].地球信息科学,2021,23(4):646-657. |
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| 作者姓名： | 於佳宁 刘凯 张冰玥 黄滢 范晨雨 宋春桥 汤国安 |
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| 作者单位： | 1.南京师范大学强化培养学院,南京 2100232.中国科学院南京地理与湖泊研究所 流域地理学重点实验室,南京 2100083.南京师范大学地理科学学院,南京 2100234.河南理工大学测绘与国土信息工程学院,焦作 454000 |
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| 基金项目： | 中国科学院战略性先导科技专项子课题(XDA23100102);国家自然科学基金项目(41801321);国家自然科学基金项目(41971403);国家自然科学基金项目(41930102) |
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| 摘 要： | 数字高程模型（Digital Elevation Model, DEM）是地球表层系统科学相关研究的基础数据,DEM数据精度的定量评价对科学选择DEM数据源、量化数据误差的影响等具有重要意义。在目前全球尺度可免费获取的DEM数据中,2018年发布的TanDEM-X 90 m DEM（TanDEM-X 90）数据凭借其较好的现势性得到了广泛关注。然而,目前大区域尺度上开展的针对TanDEM-X 90数据精度的评价工作较为有限,缺乏对其整体精度及误差空间分布特征的系统认知。本文以ICESat/GLAS卫星测高数据为评价数据,并选择SRTM-3 DEM和AW3D30 DEM作为对比数据,以平均绝对误差（MAE）、均方根误差（RMSE）、偏度和峰度等为统计指标,重点研究了TanDEM-X 90在中国主要陆地区域的误差统计特征和空间分布规律,探讨了高程、坡度、地貌类型、土地覆盖等对DEM精度的影响,并进行了适用性分析。结果表明：① 在中国区域,TanDEM-X 90数据的平均绝对误差和均方根误差分别为4.31 m和7.87 m,其高程精度与SRTM-3相近,但明显低于AW3D30;② 当坡度低于4°时,TanDEM-X 90的整体精度为3种数据中最高的;③ 对于平原、丘陵、台地这3类地貌类型,TanDEM-X 90相较SRTM-3而言具有一定精度优势;④ 本研究还以流域为单元绘制了全国尺度的TanDEM-X 90误差空间分布图,为该数据在全国尺度或典型区域的应用提供重要参考。研究也表明TanDEM-X 90在反映地表高程信息方面具有更好的时效性,能更好地反映中国区域近年来受人类活动影响的地表高程变化。
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| 关 键 词： | 数字高程模型 TanDEM-X 90 m DEM 精度评价 误差空间分布 适用性分析 ICESat/GLAS ALOS AW3D30 SRTM-3 DEM |
| 收稿时间： | 2020-08-08 |
Vertical Accuracy Assessment and Applicability Analysis of TanDEM-X 90 m DEM in China |
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| YU Jianing,LIU Kai,ZHANG Bingyue,HUANG Ying,FAN Chenyu,SONG Chunqiao,TANG Guoan.Vertical Accuracy Assessment and Applicability Analysis of TanDEM-X 90 m DEM in China[J].Geo-information Science,2021,23(4):646-657. |
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| Authors: | YU Jianing LIU Kai ZHANG Bingyue HUANG Ying FAN Chenyu SONG Chunqiao TANG Guoan |
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| Institution: | 1. Honors College, Nanjing Normal University, Nanjing 210023, China2. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China3. School of Geography,Nanjing Normal University, Nanjing 210023, China4. College of Surveying and Geotechnical Engineering, Henan Polytechnic University, Jiaozuo 454000, China |
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| Abstract: | Digital Elevation Model (DEM) is the basic data of studies on monitoring earth surface status and processes. Accuracy assessment of DEM is of great importance in selecting the optimal dataset and estimating the influences caused by DEM errors. Among all the open-access DEM data at a global scale, TanDEM-X 90 m DEM (termed as TanDEM-X 90 hereafter), released in 2018, has attracted widespread attention due to its good performance demonstrated by recent studies. However, few studies focus on the accuracy assessment of TanDEM-X 90 at a large scale, lacking the knowledge of its overall accuracy and the spatial distribution of error influencing factors. In this study, ICESat/GLAS altimetry data was used as basic reference data while SRTM-3 DEM and AW3D30 DEM were used for comparison. Using statistical parameters of Mean Absolute Error (MAE), Root Mean Square Error (RMSE), skewness, and kurtosis, this study investigated the statistical characteristics and spatial distribution patterns of TanDEM-X 90 errors across mainland China. This study also explored the impacts of elevation, slope, geomorphic type, and land cover to DEM vertical accuracy and further analyzed the applicability of TanDEM-X 90. The results indicated that: ① MAE and RMSE of TanDEM-X 90 in China are 4.31 m and 7.87 m, respectively. The overall accuracy of TanDEM-X 90 is close to that of SRTM-3 (MAE=4.72 m, RMSE=7.71 m), but obviously poorer than AW3D30 (MAE=2.69 m, RMSE=4.17 m). ② TanDEM-X 90 achieves the highest accuracy among the three DEMs when the slope is smaller than four degrees. ③ TanDEM-X 90 has better performance than SRTM-3 in three types of landforms, plains, hills, and terraces. ④ Furthermore, the spatial distributions of vertical error of TanDEM-X 90 by watershed were also represented at a national scale, which can provide a beneficial reference for the data applications. In addition, TanDEM-X 90 has been proved to be better in depicting the recent elevation changes of land surface affected by human activities because of its advantages in data acquisition time. For areas with obvious artificial reconstruction such as mining districts, the appropriate time phase of the data according to the research objectives is more important than the difference in data accuracy. This study also found that there are obvious outliers in the TanDEM-X 90 data of the existing version, which restricts the regional availability of the data. Further improvement of this data is the focus of future researches. |
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| Keywords: | Digital Elevation Model (DEM) TanDEM-X 90 m DEM accuracy assessment spatial distribution of errors applicability analysis ICESat/GLAS ALOS AW3D30 SRTM-3 DEM |
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