| WGS-84与北京54坐标的转换问题 |
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| 引用本文： | 王解先,王军,陆彩萍.WGS-84与北京54坐标的转换问题[J].大地测量与地球动力学,2003,23(3):70-73. |
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| 作者姓名： | 王解先 王军 陆彩萍 |
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| 作者单位： | 同济大学测量系,上海,200092 |
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| 基金项目： | 国家重大科学工程“中国地壳运动观测网络”项目，国家自然科学基金 (4 0 0 740 0 2 ) |
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| 摘 要： | GPS测量得到的是WGS-84中的地心空间直角坐标，而工程施工中通常使用地方独立坐标系，要求得到地方平面坐标。如何实现两者的转换，一直是工程施工中关心的热点问题。介绍了从GPS定位结果至平面坐标的两种转换模型。平面转换模型原理简单，数值稳定可靠，但只适用于小范围的GPS测量；空间转换模型可用于大范围GPS测量，按实际情况又分为7参数转换和3参数转换两种。鉴于54坐标点的大地高通常不能精确得知，对这两种转换方法得到的平面坐标的精度进行了比较，得出大地高精度主要表现为对高程的影响，对平面坐标影响较小的结论。此外，还讨论了7参数与3参数模型对转换结果的影响。
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| 关 键 词： | 坐标系 GPS 平面转换 空间转换 7参数转换 3参数转换 WGS—84 |
| 文章编号： | 1671-5942(2003)03-0070-04 |
| 修稿时间： | 2003年5月21日 |
PROBLEM OF COORDINATE TRANSFORMATION BETWEEN WGS-84 AND BEIJING 54 |
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| Wang Jiexian,Wang Jun and Lu Caiping.PROBLEM OF COORDINATE TRANSFORMATION BETWEEN WGS-84 AND BEIJING 54[J].Journal of Geodesy and Geodynamics,2003,23(3):70-73. |
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| Authors: | Wang Jiexian Wang Jun and Lu Caiping |
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| Abstract: | Results of GPS positioning are usually represented in WGS-84 frame, but in construction projects, the local grid frame are usually adopted. How to carry out the coordinate transformation is always the problem concerned by surveyors. This paper introduces two algorithms for transferring the GPS result to local grid frame, these are plane transform model and the space transform model. The theory of the plane transform model is understandable and the result is reliable, but it is not suitable for large scale GPS network. The space transform model can be used in large scale GPS network. According to the project situation, the space transform model can be divided to seven-parameter model and there-parameter model. Because the ellipsoidal height on Beijing-54 ellipse usually can not be precisely known, this paper analyze the influence on plane coordinate precision and draws the conclusion that the precision of the plane coordinate influenced by the ellipsoidal height is very small. The difference between seven-parameter and there-parameter model is discussed as well. |
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| Keywords: | coordinate system GPS plane transformation space transformation |
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