| 城市GPS高程控制网的建立方法与精度分析 |
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| 作者单位： | 西南交通大学，西南交通大学，西南交通大学 四川成都610031，成都市勘察测绘研究院，四川成都610081，四川成都610031，四川成都610031 |
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| 摘 要： | 针对城市测量控制网的特点,探讨了利用GPS技术建立城市高程控制网的方法。同时,根据线状、环状与面状城市GPS控制网的不同,提出了采用自适应的拟合模型(平面、二次曲面、样条函数等)实现GPS大地高与正常高的优化转换方法。结合成都地区的实例进行了试验结果表明,在该地区可以通过适当分布的GPS/水准重合点,采用比较简单的高程拟合方法,即可获取较高精度级别的正常高。从而部分或全部取代低等级(含四等)的水准测量。
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| 关 键 词： | 城市高程控制网 高程拟合 精度 GPS |
Accuracy Analysis and Constructing Method of GPS Height Control Network of City |
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| LI Chun-hua,,HUANG Ding-fa,ZHANG Xian-zhou. Accuracy Analysis and Constructing Method of GPS Height Control Network of City[J]. Journal of Institute of Surveying and Mapping, 2008, 0(2) |
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| Authors: | LI Chun-hua HUANG Ding-fa ZHANG Xian-zhou |
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| Affiliation: | LI Chun-hua1,2,HUANG Ding-fa1,ZHANG Xian-zhou1 |
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| Abstract: | The constructing method of GPS height control network of city was discussed.Several optimization interpolating methods by which the ellipsoid height could be transformed into the orthometirc height were proposed.The method could adaptively model surface to fit various,linear,ringed or plane,GPS control network.The experiments used the data of Chengdu city.The results showed that the precise orthometirc height could be interpolated by properly arranging GPS/leveling superposition points,even it could replace part or all the lower order levelings including fourth order leveling. |
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| Keywords: | height control network of city elevation fitting accuracy GPS |
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