| 双因子抗差贝叶斯估计及其在GIS数据采集质量控制中的应用 |
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| 引用本文： | 张菊清.双因子抗差贝叶斯估计及其在GIS数据采集质量控制中的应用[J].测绘工程,2006,15(6):20-23. |
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| 作者姓名： | 张菊清 |
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| 作者单位： | 长安大学,地质工程与测绘工程学院,陕西,西安,710054 |
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| 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。
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| 关 键 词： | 数字化 粗差 系统误差 双因子抗差估计 |
| 文章编号： | 1006-7949（2006）06-0020-04 |
| 收稿时间： | 2006-04-21 |
| 修稿时间： | 2006年4月21日 |
Bifactor robust Bayesian estimation and its application to quality control of GIS data capture |
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| ZHANG Ju-qing.Bifactor robust Bayesian estimation and its application to quality control of GIS data capture[J].Engineering of Surveying and Mapping,2006,15(6):20-23. |
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| Authors: | ZHANG Ju-qing |
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| Abstract: | 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,digital-point coordinates and both of them are provided respectively. |
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| Keywords: | digitization gross error systematic error bifactor robust Bayesian estimation |
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