测绘通报 ›› 2022, Vol. 0 ›› Issue (10): 114-117,157.doi: 10.13474/j.cnki.11-2246.2022.0304

• 技术交流 • 上一篇    下一篇

基于多项式曲面拟合模型的高程转换方法及其结果分析

陈安平1, 李红伟2, 谢刚生2, 姚朝龙2, 谢辉荣2   

  1. 1. 广东省地质测绘院, 广东 广州 510800;
    2. 华南农业大学, 广东 广州 510640
  • 收稿日期:2022-03-03 修回日期:2022-08-26 发布日期:2022-11-02
  • 通讯作者: 谢刚生。E-mail:cyberxp@163.com
  • 作者简介:陈安平(1979-),男,硕士,高级工程师,主要从事测绘领域的相关工作。E-mail:21885605@qq.com
  • 基金资助:
    国家自然科学基金(42004013)

Height conversion method and result analysis based on polynomial surface fitting model

CHEN Anping1, LI Hongwei2, XIE Gangsheng2, YAO Chaolong2, XIE Huirong2   

  1. 1. Geology Surveying and Mapping Institute of Guangdong, Guangzhou 510800, China;
    2. South China Agricultural University, Guangzhou 510640, China
  • Received:2022-03-03 Revised:2022-08-26 Published:2022-11-02

摘要: 本文针对影响多项式高程转换精度的两个主要因素(拟合模型选择和拟合点选取),在分析不同阶次多项式表达特征的基础上,基于一次多项式拟合残差信息,提出了综合不同多项式曲面模型的GNSS高程转换方法,并通过实例验证了该方法的有效性。结果表明,利用一次多项式拟合残差空间分布信息反映的测区高程异常变化特征,作为二次多项式分区拟合区域划分或三次多项式拟合点选取的依据,进行高程拟合,可以将高程拟合精度从厘米级提高至毫米级。

关键词: 高程转换, 高程异常, 多项式拟合, 拟合残差, 拟合精度

Abstract: Considering the impacts of selection of fitting models and fitting points on the precision of height conversion based on polynomial surface fitting, this study proposed GNSS height fitting methods by integrating different polynomial curved surface models based on the analysis of their features and the information about fitting residuals of fist order polynomial. The effectiveness of the proposed model was evaluated by a case study. The results show that the spatial distribution of fitting residuals of fist order polynomial, which reflects the feature of regional height anomalies, can provide a basis for dividing sub-regions for quadratic polynomial fitting or the selection of fitting points for cubic polynomial, and the fitting precision can be increased from centimeter level to millimeter level.

Key words: height conversion, height anomaly, polynomial fitting, fitting residual, fitting precision

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