A Method of Terrain Correction for Regional Gravity Surveys
Liu Wenjin, Xi Jiajian, Zhang Xingya, 1989. "A Method of Terrain Correction for Regional Gravity Surveys", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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A procedure of terrain correction for regional gravity surveys, which has been extensively adopted in China, is introduced. By using the inverse-square weighted average and bilinear interpolation, altitudes taken from aerophotographic maps for the innermost zone and from the unified nationwide network with the gridding of 1 km × 1 km for the second and outermost zones are interpolated to establish digital terrain models (DTM) for the terrain corrections. Field tests were made in the Qinling Mountains of Shaanxi Province and the Dama Mountains of Jilin Province. The test results show that the accuracy of terrain correction is less than 200 μGal.