GPS工程控制网投影面选择的简易方法  

Facility Method of Projection Plane Choice of GPS Engineering Control Network

作　　者：田云彪 李勇[2] 

机构地区：[1]西南有色大理宏兴测绘有限责任公司,云南大理671000 [2]云南省地矿局玉溪区域地质调查队,云南玉溪653100

出　　处：《地矿测绘》2005年第4期36-36,38,共2页Surveying and Mapping of Geology and Mineral Resources

摘　　要：结合工程实践,总结出了3种GPS工程控制网投影面选择的简易方法。方法一:以全站仪实测平均高程面边长两端点的平面直角坐标及高程为起算数据计算测区平均高程面各GPS点的坐标及高程;方法二:以单一固定点平面直角坐标和高程为起算,用全站仪实测边长为控制,通过平差软件确定高程投影面;方法三:基于平差软件的自定义坐标系统,采用任意中央子午线下测区平均高程面为投影面。经实例验证,所述3种方法可用于局部的GPS工程控制网的高程投影面选择。Based on engineering practice, three kinds of projection plane choice of engineering control net are summed up, these methods are： method one is to take average height observed by total station instrument, and sidelength double ends＇coordinate ＆ heights as initial data, calculating GPS points＇coordinates and heights; method two is to take Cartesian coordinate and the height of single fixed point as initial point, taking actual sidelength observed by total station instrument, determining height projection plane by means of adjustment software ; method three is, based on self-defining coordinate system of adjustment software, to take survey field average height as projection plane of option central meridian. Through the verification of the practice, above mentioned three methods are useful for the choice of projection plane of local GPS engineering control net.

关 键 词：GPS工程控制网 中央子午线 投影面 高程抵偿面 

分 类 号：P228.4[天文地球—大地测量学与测量工程]