| 珠海市陆海统一似大地水准面精确求定 |
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| 引用本文： | 李秀龙,丁建勋.珠海市陆海统一似大地水准面精确求定[J].测绘与空间地理信息,2017(6):163-165. |
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| 作者姓名： | 李秀龙 丁建勋 |
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| 作者单位： | 珠海市测绘院,广东珠海,519015 |
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| 摘 要： | 在海域广阔、河网密布的海滨城市珠海,基于区域陆海重力、地形数据,利用第二类Helmert凝集法精确求取了覆盖珠海市陆海全域的重力似大地水准面,解决了跨海岸线重力归算等关键问题;通过球冠谐调和分析法,将求取的重力似大地水准面与新测的高精度GNSS水准成果融合,获取了珠海市2'×2'陆海统一似大地水准面。以港珠澳大桥首级控制点为主的精度统计表明,该陆海统一似大地水准面模型外符合精度达到±0.008 m。
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| 关 键 词： | 似大地水准面 陆海统一 GNSS 水准 重力场 |
Precise Determination of the Terrestrial and Marine Unified Quasi-geoidin in Zhuhai City |
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| LI Xiu-long,DING Jian-xun.Precise Determination of the Terrestrial and Marine Unified Quasi-geoidin in Zhuhai City[J].Geomatics & Spatial Information Technology,2017(6):163-165. |
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| Authors: | LI Xiu-long DING Jian-xun |
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| Abstract: | In the coastal city of Zhuhai,the waters is greater than the land area.Based on the regional gravity and topography data,the gravity quasi-geoid in Zhuhai was determined by the Helmert's second condensation method,which has solved the key problem such as across the coastline gravity reduction.Then the GNSS/leveling data and the gravity quasi-geoid was derived with spherical cap harmonic methodandhas determined the terrestrial and marine unified quasi-geoid of 2' ×2' resolutionwith accuracy of ±0.008 m. |
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| Keywords: | quasi-geoid the terrestrial and marine unified GNSS levelling gravity field |
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