| 对ASTER GDEM数字高程模型的精度评价及修正 |
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| 引用本文： | 杨帅,胡保健,胡占占,张志号.对ASTER GDEM数字高程模型的精度评价及修正[J].北京测绘,2021,35(2):161-165. |
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| 作者姓名： | 杨帅 胡保健 胡占占 张志号 |
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| 作者单位： | 山东科技大学测绘科学与工程学院,山东青岛266590 |
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| 摘 要： | 针对ASTER GDEM高程精度还未得到充分验证,以江西省莲花县为试验区,使用ICESat-2数据系统分析了ASTER GDEM在坡度、地形起伏度和土地利用类型中的误差分布。结果表明,ASTER GDEM受坡度、地形起伏度影响严重,随坡度、地形起伏度增加,GDEM误差呈上升趋势;对于不同土地利用类型,GDEM误差存在较大差异,在水域误差最大,在建设用地误差最小。最后,使用后向传播神经网络(BPNN)对莲花县ASTER GDEM修正,结果发现BPNN模型可以有效改善其高程精度。
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| 关 键 词： | 冰、云和陆地高程卫星2(ICESat-2) 先进星载热发射和反射成像仪全球数字高程模型(ASTER GDEM) 精度评价 修正 |
Accuracy Evaluation and Correction of ASTER GDEM Terrain Data |
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| YANG Shuai,HU Baojian,HU Zhanzhan,ZHANG Zhihao.Accuracy Evaluation and Correction of ASTER GDEM Terrain Data[J].Beijing Surveying and Mapping,2021,35(2):161-165. |
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| Authors: | YANG Shuai HU Baojian HU Zhanzhan ZHANG Zhihao |
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| Institution: | (College of Geomatics,Shandong University of Science and Technology,Qingdao Shandong 266590,China) |
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| Abstract: | The advanced spaceborne thermal emission and reflection radiometer global digitial elevation model(ASTER GDEM)is widely used in many fields with its high precision,high coverage,and free use.However,its elevation accuracy has not been fully verified.This paper took Lianhua County in Jiangxi Province as the test area and analyzed the error distribution of ASTER GDEM in slope,topography relief and land use type using the newly released ICESat-2 altimetry data.The results showed that ASTER GDEM elevation accuracy was about 14.1 m,which was better than its nominal accuracy of 20 m.ASTER GDEM was seriously affected by slope and topography relief.With the increase of slope and topography relief,the error of ASTER GDEM basically showed an upward trend.For different land use types,the error of ASTER GDEM was quite different,and the error in the water area was the largest,the smallest error in construction land.Finally,an artificial neural network(ANN)was used to correct the ASTER GDEM data in Lianhua County,and it was found that the ANN model could effectively improve the ASTER elevation accuracy. |
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| Keywords: | Ice Cloud and Elevation Sate llite-2(ICESat-2) Andvanced Spaceborne Thermal Emission and Reflection Radiometer Global Digitial Elevation Model(ASTER GDEM) accuracy assessment corrected |
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