湖南地区似大地水准面模型再精化研究  

Research of Hunan quasi-geoid model refining

作　　者：张华剑[1,2] 华亮春[1,2] 敖敏思[1,2] 陈春花[1,2] 

机构地区：[1]湖南省测绘科技研究所,湖南长沙410007 [2]中国测绘科学研究院(湖南分院),湖南长沙410007

出　　处：《测绘工程》2017年第1期13-16,共4页Engineering of Surveying and Mapping

基　　金：地理空间信息工程国家测绘地理信息局重点实验室资助项目(201415);湖南省省属科研机构技术创新发展专项重点项目(2012TF1004)

摘　　要：湖南地区2007版似大地水准面模型存在数据源质量相对不高、局部区域存在粗差等问题。通过引入EGM2008地球重力场模型、高分辨率DEM数据、高精度GPS/水准数据等新数据源,采用最小二乘配置法与格林基函数样条插值算法,在原有模型的基础上得到1′×1′分辨率的再精化新模型。精度检测结果表明,新模型的内、外符合精度相较2007模型提升80.7%和22.9%,有效降低汉寿等地区的残差,对湖南省地区的复杂地形具有更好的适用性。There are several problems in the current quasi-geoid model established in Hunan area in 2007, such as the low quality of data source, and the gross error in some local areas. In this paper, a new quasigeoid model with 1′× 1′ high resolution based on the existing one is established by using the new data source. Meanwhile, the EGM2008 earth gravity model, DEM with high resolution, and precise GPS/ leveling data are introduced to improve the accuracy and reliability. Both the least-squares approach and Green function-based spline interpolation algorithm are also used for the refinement of the new quasigeoid model. The results of accuracy tests show that the inner and external coincidence precision of the new model is significantly superior compared to the existing one by increasing 80. 7% and 18. 8%, respectively. It also can be seen that the residual error of the new model decreases effectively in some local areas, for example, Hanshou Region in Changde City, which indicates the better performance of the new model for the complex topographic feature in Hunan area.

关 键 词：似大地水准面模型再精化 EGM2008模型 格林基函数样条方法 最小二乘配置法 

分 类 号：P228.4[天文地球—大地测量学与测量工程]