基于矿区GPS网投影带和投影面的合理选择  

Rational choosing of projection zone and perspective plane based on GPS network of mining area

作　　者：孙金礼[1] 周志富[1] 杨莉[1] 

机构地区：[1]山西大同大学工学院,山西大同037003

出　　处：《辽宁工程技术大学学报（自然科学版）》2008年第5期665-667,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：辽宁省教育厅基金资助项目(05L181)

摘　　要：针对许多矿区远离国家3°带中央子午线或是地势较高,造成GPS控制网的边长尺度与开采水平以及地面实际测量的边长尺度不相一致,产生长度投影变形,从而使其成果不能满足1:500比例尺测图和施工放样以及巷道贯通的精度要求这一重要的技术问题。从理论上分析了将实测边长归算到参考椭球面上和将参考椭球面上的边长归算到高斯投影面上的长度变形影响规律,讨论限制和减小这种投影变形影响的理论方法。提出了合理选择投影带和投影面的具体方案,并以大同矿区GPS网平面坐标系统建立中投影带和投影面的选择实例验证了该方法在实际应用中是切实可行的。Lots of mining areas are far away from the national zone dividing prime meridians of three degree or located on high relief, which results in the fact that the side lengths of GPS control network is at variance with mining levels and the actual ground measures. Then it brings length projection distortion and makes the product of the network fail to meet the precision level of one to five hundred scale plotting, construction layout and laneway breakthrough. The paper analyzes theoretically the influence law of length distortion after the reductions from measured side length to reference ellipsoid surface and then from side length on the reference ellipsoid surface to gauss perspective plane. It also discusses theoretical methods to restrict and the projection distortion influence. It proposes idiographic schema to rationally choose projection zone and perspective plane. The choice of projection zone and perspective plane in the establishment of plane coordinate system of GPS network in Datong mining area has validated that the schema is feasible.

关 键 词：GPS网 投影带 投影面 投影变形 长度变形 

分 类 号：P208[天文地球—地图制图学与地理信息工程]