The impact and effect of DEM grid spacing on the accuracy of gravity remote topographic correction
LI Zhong-Ping1,2(), DAI Guang-Kai3, ZHANG Mao-Hui4
1. School of Geophysics and space information, China University of Geosciences(Wuhan),Wuhan 430074,China 2. Zhengyuan Geology & Exploration Institute of Shandong,Bureau of China Metallurgy and Geology,Jinan 250014,China 3. Shandong Institute of Geological Survey, Jinan 250013, China 4. School of Geophysics and Space Information, China University of GeosciencesOcean University of China, Qingdao 266100, China
The 1∶50 000 gravity far area terrain correction is generally obtained from the 1∶50 000 DEM elevation model correction in the survey area. 1∶50 000 DEM can be spliced according to different grid spacings, which correspond to different terrain correction accuracies; RGIS is calculated by its own elevation database, and the topographic correction of 1∶50 000 gravity far area in the survey area is completed. The authors chose the 1∶50 000 gravity remote area I (2~20 km) land reform of Zangjiazhuang area in Qixia City, Shandong Province, as an example. Through the use of 25, 50, 100, 200 m four grid node spacings for 1∶50 000 DEM data splicing and the use of the improved bilinear interpolation method, the authors calculated the terrain correction and mean square error in the far area I of gravity. Compared with the terrain correction mean square error of gravity far area I of RGIS own elevation reservoir, it is confirmed that the terrain correction accuracy of gravity far-Ⅰ area based on 1∶50 000 DEM elevation model is better than that of gravity far-Ⅰ area with RGIS.
李忠平, 戴广凯, 张茂辉. DEM网格间距对重力远区地改精度的影响及效果[J]. 物探与化探, 2020, 44(6): 1399-1407.
LI Zhong-Ping, DAI Guang-Kai, ZHANG Mao-Hui. The impact and effect of DEM grid spacing on the accuracy of gravity remote topographic correction. Geophysical and Geochemical Exploration, 2020, 44(6): 1399-1407.
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