长沙市实时高程转换模块的确定
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摘要
目前,似大地水准面精化是解决大地高与正常高之间转换的最有效途径;但其转换模型属于机密数据,不能在外业测绘生产中用其进行实时转换。本文针对长沙地区高程异常的变化特点,采用分块插值拟合算法对其进行插值拟合,并编写成高程转换模块;GPS RTK工程软件调用该模块后,即可实现WGS-84椭球大地高到正常高的实时转换;经检核,本模型内、外符合精度均优于规范要求,解决了长沙市实时高程转换问题。
Until now,the quasi-geoid is the most effective way to solve the conversion between geodetic height and normal height; but the conversion model of quasi-geoid is confidential data,it can not be used in the surveying production. According to the characteristics of height anomaly in Changsha area,the elevation conversion module which uses the block interpolation algorithm is presented in the paper. It can be used by GPS RTK software to solve the real-time conversion from geodetic height of WGS-84 ellipse to normal height. After checking progress,the precision of the model is better than that in specification whatever precision and accuracy. The problem of real-time elevation conversion is solved in Changsha City.
Until now,the quasi-geoid is the most effective way to solve the conversion between geodetic height and normal height; but the conversion model of quasi-geoid is confidential data,it can not be used in the surveying production. According to the characteristics of height anomaly in Changsha area,the elevation conversion module which uses the block interpolation algorithm is presented in the paper. It can be used by GPS RTK software to solve the real-time conversion from geodetic height of WGS-84 ellipse to normal height. After checking progress,the precision of the model is better than that in specification whatever precision and accuracy. The problem of real-time elevation conversion is solved in Changsha City.
引文
[1]CJJ/T 73-2010.卫星定位城市测量技术规范[S].
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[7]李晓桓.GPS水准拟合模型的优选[J].测绘通报,2003(7).
[2]边少锋,柴洪洲,金际航.大地坐标系与大地基准[J].国防工业出版社,2005.
[3]程序.局域大地水准面精化中拟合方法的研究[D].武汉大学硕士学位论文,2006.
[4]李建成,陈俊勇,宁津生等.地球重力场逼近理论与中国2000似大地水准面的确定[M].武汉大学出版社,2003.
[5]北京清华三维新技术开发有限公司.EPS2008地理信息工作站使用说明书[R].2010,8.
[6]高伟,徐绍铨.GPS高程分区拟合转换正常高的研究[J].武汉大学学报·信息科学版,2004(10).
[7]李晓桓.GPS水准拟合模型的优选[J].测绘通报,2003(7).