摘要
在对GIS扫描数字化过程中,所采集的数据里经常含有系统误差和异常误差。在纠正这些误差的过程中,应同时考虑控制点坐标和数字化坐标的先验协因数。文中以数字化的系统误差拟合模型为例,提出双因子抗差贝叶斯估计误差拟合方法,并分别就控制点含有粗差、数字化点含有粗差和两者均含有粗差3种情况建立相应的模型,实例验证了其抗差效果。
In the process of GIS scan digitizing, there are many errors including systematic errors and gross errors in the obtained data. Accordingly, the prior covariance of control-point coordinates and digital-point coordinates should be considered at the same time. Based on the model of systematic error fitting, a method of bifactor robust Bayesian estimation is proposed , and three models under outlier errors in control-point coordinates, digitalpoint coordinates and both of them are provided respectively.
出处
《测绘工程》
CSCD
2006年第6期20-23,共4页
Engineering of Surveying and Mapping
关键词
数字化
粗差
系统误差
双因子抗差估计
digitization
gross error
systematic error
bifactor robust Bayesian estimation
