摘要
给出了由地球重力场模型计算重力异常和垂线偏差的公式,利用36阶、360阶EGM96、EGM2008地球重力场模型计算了国内某地区格网点重力异常和地面垂线偏差,并将其与实测数据进行比较,从而对这两种模型的精度进行了分析和比较。结果表明,在表示国内某地区格网点重力异常时,EGM2008模型精度较高;在表示地面垂线偏差时,两种模型的精度相当。
The formulas used to calculate the gravity anomaly and the vertical deflection by the earth gravity field model are given. The grid point gravity anomaly and the ground vertical deflection of certain place in China, are calculated by the EGM96 and the EGM2008 in 36,360 degrees and compared with the surveying data. And then the precision of these two kinds of earth gravity field models are analyzed and compared. The results show that the precision of EGM2008 is higher when expressing the grid point gravity anomaly of certain place in China, and the EGM96 and the EGM2008 is equal when expressing the ground vertical deflection.
出处
《海洋测绘》
2010年第2期55-57,共3页
Hydrographic Surveying and Charting
基金
国家自然科学基金(40774031)
全国优秀博士论文专项基金(200344)
卫星导航与定位教育部重点实验室(B类)开放基金(GRC-2009010)
中科院动力大地测量学重点实验室开放基金(L06-06).