不同源DEM数据在高山区重力中区地形改正中的适用性

doi:10.11720/wtyht.2019.0126

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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.

Key words： high mountain areas DEM gravity median region terrain correction

Received: 12 March 2019 Published: 25 October 2019

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	Articles by authors
	Sheng-Rong LIU
	Peng GAO
	Tao GENG
	Wei-Li GUO
	Hui DU

Cite this article:

Sheng-Rong LIU,Peng GAO,Tao GENG, et al. The applicability of different sources DEM data in median region terrain correction of gravity in high mountain areas[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 1111-1118.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0126 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/1111

Satellite image and gravity point distribution in the experimental area

Different DEM data renderings in the experimental area

1:2 000 DEM and 1:50 000 DEM elevation difference curve

1:2 000 DEM and Aster DEM elevation difference curve

1:2 000 DEM and Pleiades DEM elevation difference curve

Vertical accuracy statistics of three DEM data

Terrain correction square domain calculation diagram

1:50 000 DEM central area terrain correction error distribution interval

Aster DEM central area terrain correction error distribution interval

Pleiades DEM central area terrain correction error distribution interval

Central area terrain correction accuracy statistics of three DEM data (unit: 10^-5 m/s²)

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