EGM2008重力场模型在兴城物探测量中的应用  

Application of EGM2008 in geophysical prospecting survey in Xingcheng

作　　者：李树文[1] 吴琼[1] 李宏卿[1] 李磊[1] 杨国东[1] 刘国光[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2014年第1期209-214,共6页World Geology

基　　金：国土资源部公益性行业科研专项经费项目(201011083)

摘　　要：以吉林大学兴城物探教学实习测网为例,基于EGM2008重力场模型,采用二次曲面、移动曲线、最小二乘配置、三次样条和反距离加权改正插值法,计算了不同GPS水准点密度情况下的水准面模型,并利用二等水准测量方法验证了计算精度,分析了该模型的适定性。结果表明,三次样条插值法的精度和稳定性最高,其次是移动曲线法和最小二乘配置法;二次曲面拟合的精度最低,反距离加权改正法稳定性最差。所有算法都表明,在研究区,当GPS水准点间隔20 km时,基于EGM2008模型确定的大地水准面精度在0.1 m以内;而采用单独GPS水准点的区域大地水准面模型能达到14cm,完全满足各种比例尺情况下的石油物探测量要求。Taking the network of Xingcheng geophysical teaching and practicing area of Jilin University as a case,we calculated the geoid model with different point density using quadratic surface fitting,moving curve fitting,inverse distance weighting interpolation,cubic spline interpolation and least square collocation based on EGM2008.The precision of the normal height was validated by the second order leveling.The applicability of model used in geophysical prospecting survey was analyzed.The results indicated that the cubic spline interpolation has the highest precision and stability.The moving curve fitting and least square collocation also have high precision and stability.The quadratic surface fitting has the lowest precision and the inverse distance weightinginterpolationhas the lowest stability.All the algorithms indicated that in the studied area when the mean interval of calculating points is 20 km,the precision of the geoid model which based on EGM2008 is less than 0.1 m.When calculated with single GPS leveling point the precision of the model is 14 cm,which completely met the requirements of survey in petroleumgeophysical prospecting with different scales.

关 键 词：EGM2008 GPS水准 高程拟合 物探测量 兴城 

分 类 号：P223.6[天文地球—大地测量学与测量工程]