极坐标法放样曲线中弦长代替弧长的精度分析  

Accuracy Analysis of Chord Length Replacing Arc Length in Laying off Curve by Polar Coordinate Method

作　　者：李金生[1] 刘岩[1] 张博[1] 栾玉平[1] 

机构地区：[1]沈阳农业大学高等职业技术学院,辽宁沈阳110122

出　　处：《测绘与空间地理信息》2010年第5期21-23,共3页Geomatics & Spatial Information Technology

基　　金：辽宁省高教学会高职教育教学改革科研专项(GZYB09001)资助

摘　　要：曲线放样是线路工程测量中的主要工作,起初使用经纬仪和钢尺进行偏角法放样,现在主要使用全站仪坐标法放样,在此期间经历了由经纬仪和测距仪组成的半站仪的极坐标法,直到现在有些基层部门仍在使用此法。本文旨在解决极坐标放样时极距的准确计算问题,同时讨论直接用弧长代替弦长时的精度。Laying off curve is the primary job in route survey.The method of deflection angle with transit and steel ruler was used in the beginning in laying off curve,and coordinate method with total station instrument is used at present.In the meantime,polar coordinate method with half-station instrument composed by transit and rangefinder was used,which is still used by some primary level departments.In this paper,it is conducted to solve calculating the problem of polar distance in polar coordinate method in laying off curve,and discuss the accuracy of arc length replacing chord length directly.

关 键 词：曲线测设 综合曲线 偏角法 极坐标法 直角坐标法 

分 类 号：P258[天文地球—测绘科学与技术]