考虑地球曲率的重力地形改正方法研究

Research on Gravity Terrain Correction Method Considering Earth’s Curvature

以球壳模型重力地形改正计算理论为依据,探索了地平线偏差和未考虑地球曲率的平板模型对重力地改的影响;研究了平板模型重力地改精度与地改内半径、工作区整体海拔和测点间高差的关系。通过理论模型试验和实测资料计算,发现工作区整体海拔和测点间高差对重力地形改正有较大影响,提出使用高分辨率DEM数据计算重力地形改正值时,参考工作区海拔高程和测点间高差,从中区即采用球壳模型计算,并给出了建议参数,可较大程度地提高重力地形改正精度。

Based on the calculation theory of gravity terrain correction of spherical shell model,explored the effect of horizon deviation and flat-plate model not accounting for Earth’s curvature on gravitational ground modification,studied the relationship between the accuracy of gravity ground modification of the slab model and the inner radius of the ground modification,the overall altitude of the work area and the height difference between the measuring points.Through the test of the theoretical model and the calculation of the measured data,it is found that the overall altitude of the working area and the height difference between the measuring points have a great impact on the gravity terrain correction.The spherical shell model should be used for calculation,and the suggested parameters are given,which can greatly improve the accuracy of gravity terrain correction.