偏角法,method of deflection angles
declination method偏角法
1.Making use of the construction guideline to lay off the major points for the transition curve of the road with the distancer and polar method, and making the measuring and setting in detail of the points on the transition curve of the road withdeclination method, can increase effectively the accuracy of the points location of all major points, reduce erro.通过采用测距仪和极坐标方法,利用施工导线放取道路缓和曲线的主要点,采用偏角法对道路缓和曲线布点进行详细测设,有效地提高了各主要点的点位精度,减少了测设中的误差,保证了道路缓和曲线线型的圆滑。
3)General drift angle method总偏角法
4)coordinate-deflection angle method坐标偏角法
5)deflected angle method on a fixed point定点偏角法
6)center declination method圆心偏角法
1.By combining with example of the construction line-putting of Xiqu Fen river Bridge in Gujiao city,the paper introduces two kinds of curve coordinate calculation method,that is tangent offset method and thecenter declination method,according to comparison analysis and chooses a new method,center declination method which is easier to operate than the tangent offset method and makes less mistakes.结合古交市西曲汾河大桥施工放线的实例,介绍了两种曲线坐标计算方法,即切线支距法和圆心偏角法,通过对比分析,选出一种比切线支距法更简捷和不容易出错的计算坐标的新方法——圆心偏角法。
延伸阅读
磁偏角磁偏角geomagneticdeclination地球表面任一点的磁子午圈同地理子午圈的夹角。因指南针、磁罗盘是测定磁偏角最简单的装置，所以磁偏角的发现和测定的历史也很早。1702年，英国E.哈雷发表了第一幅大西洋磁偏角等值线图。根据规定，磁针指北极N向东偏则磁偏角为正，向西偏则磁偏角为负。磁偏角测量仪
