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The applicability of different sources DEM data in median region terrain correction of gravity in high mountain areas |
Sheng-Rong LIU1,2,3, Peng GAO1,2, Tao GENG1,2, Wei-Li GUO1,2, Hui DU1,2 |
1. Xi’an Center of China Geological Survey, Xi’an 710054, China; 2. Northwest Geological Science and Technology Innovation Center,Xi’an 710054, China; 3. Centre for Orogenic Belt Geology, CGS, Xi’an 710054, China; |
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Abstract Taking the Xiarihamu mining area in Qinghai Province as an alpine experimental area, the authors used the high-precision 1:2,000 DEM data to make a comparative analysis of the vertical accuracy of 1:50,000 DEM data, Aster DEM data and Pleiades DEM data as well as the applicability of these data in median region terrain correction of gravity under the complex terrain conditions such as high mountain areas. The results show that the accuracy of Pleiades DEM is the highest, that of 1:50,000 DEM possesses the second place, and hat of Aster DEM is the lowest under the complex terrain conditions of high mountainous area. The Pleiades DEM data have good applicability in median region terrain correction of gravity scale of 1:50,000 or less, and the 1:50,000 DEM data have good applicability at a scale of 1:200,000 or less, but the Aster DEM cannot meet the accuracy requirements at a scale of 1:200,000 or more.
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Received: 12 March 2019
Published: 25 October 2019
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Satellite image and gravity point distribution in the experimental area
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Different DEM data renderings in the experimental area
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1:2 000 DEM and 1:50 000 DEM elevation difference curve
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1:2 000 DEM and Aster DEM elevation difference curve
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1:2 000 DEM and Pleiades DEM elevation difference curve
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DEM数据源 | 最大值/m | 最小值/m | 均方误差/m | 1:50000 DEM | 36.86 | 0.03 | 12.50 | Aster DEM | 40.71 | 0.03 | 14.15 | Pleiades DEM | 6.63 | 0.01 | 2.06 |
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Vertical accuracy statistics of three DEM data
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Terrain correction square domain calculation diagram
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1:50 000 DEM central area terrain correction error distribution interval
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Aster DEM central area terrain correction error distribution interval
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Pleiades DEM central area terrain correction error distribution interval
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DEM数据源 | 最大值 | 最小值 | 均方误差 | 1:50000 DEM | 4.517 | 0 | 0.182 | Aster DEM | 4.202 | 0.001 | 0.280 | Pleiades DEM | 1.062 | 0.001 | 0.042 |
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Central area terrain correction accuracy statistics of three DEM data (unit: 10-5 m/s2)
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