摘要
对黄岛试验区实测数据进行最小二乘平差和抗差估计解算,结果表明,对于10km以内的跨海距离,基于三角高程测量的跨海正常高程传递精度为2mm/km,达到二等水准的要求。基于三角高程测量的跨海正常高差与直接观测的水准高差和EGM08模型的计算高差互差均小于3mm/km,与天文重力水准计算的高差互差为5mm/km。
Trigonometric levelling precision is mainly affected by the atmospheric vertical refraction.Laid by quadrilateral,simultaneous and reciprocal observation can eliminate errors caused by atmospheric vertical refraction and improve the precision of the difference of elevation.The robust estimation and least squares adjustment results of the measured data of Huangdao show that for the sea-crossing distance less than 10km,the precision of the normal height transference based on trigonometric levelling which is 2mm/km can fulfill the precision request of second order levelling.Sea-crossing difference of elevation based on trigonometric levelling comparing with the direct observation by geometric levelling and the calculations of EGM08 model,the difference between them is less than 3mm/km,and comparing with the astrogravimetric levelling,the difference is less than 5mm/km.
出处
《海洋测绘》
2011年第6期59-62,共4页
Hydrographic Surveying and Charting
关键词
高程系统
三角高程
EGM模型
天文重力水准
折光误差
height datum
trigonometric levelling
earth gravitational model
astro-gravimetric levelling
vertical refraction error
