| 清远市清城区似大地水准面的精密确定 |
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| 引用本文： | 洪镇填,唐力明,林铁.清远市清城区似大地水准面的精密确定[J].测绘工程,2008,17(4). |
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| 作者姓名： | 洪镇填 唐力明 林铁 |
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| 作者单位： | 广东省国土资源厅测绘院,广东,广州,510500;广东省国土资源厅测绘院,广东,广州,510500;广东省国土资源厅测绘院,广东,广州,510500 |
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| 摘 要： | 利用GPS技术可获得精度优于1 cm的大地高,若能够获得相应点的高精度似大地水准面(高程异常),则可将大地高转换为相应精度的正常高,从而代替相应等级的水准测量.文中介绍了清远市清城区似大地水准面的计算方法,并对计算结果进行了分析和评价.结果表明,清远市清城区1 km格网似大地水准面的精度为1.3 cm.
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| 关 键 词： | 似大地水准面 地球重力场模型 数字高程模型(DEM) |
Precision of the quasi-geoid for Qingcheng distriot,Qingyuan city |
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| HONG Zhen-tian,TANG Li-ming,LIN Tie.Precision of the quasi-geoid for Qingcheng distriot,Qingyuan city[J].Engineering of Surveying and Mapping,2008,17(4). |
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| Authors: | HONG Zhen-tian TANG Li-ming LIN Tie |
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| Abstract: | It's possible to get the geodetic height with the precision of 1 cm by GPS.If the quasi-geoid could be obtained with high precision,then the geodetic height can be transformed into the normal height with the same precision,and the GPS technique together with the quasi-geoid can be employed to substitute as the same leveling with high precision.The precision method of the quasi-geoid for Qingcheng distriot,Qingyuan city,is introduced in this paper,and then the quasi-geoid is analyzed and evaluated.The results show that the accuracy of the quasi-geoid can arrive at 1.3 cm. |
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| Keywords: | quasi-geoid earth's gravity field model digital elevation model(DEM) |
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