【摘要】 针对青藏高原地区大部分城市具有东西跨度大、海拔高、地形要素简单、人口密度低、城市建设相对缓慢等特点,探讨了处理城市全球卫星导航系统(GNSS)控制网中的投影长度变形的控制方法。以某城市C级GNSS控制网为实例,计算分析了城市平面坐标系的三种建立方法。结果表明:该城市采用2000国家大地坐标系(CGCS2000)的椭球参数、任意带加平均高程面(主要城市建设发展区域)的投影方法建立城市平面控制网,能够满足城市控制网对长度变形的要求。更多还原

【Abstract】 In view of the characteristics of most cities in the Qinghai Tibet plateau, such as large east-west span, high altitude, simple terrain elements, low population density and relatively slow urban construction, this paper discusses in detail the control method of processing projection length deformation in urban Global Navigation Satellite System(GNSS) control network.Taking the C-level GNSS control network of a city as an example, three methods of establishing urban plane coordinate system are calculated and analyzed.The results show that: the ellipsoid parameters of China Geodetic Coordinate System 2000(CGCS2000) and the projection method of arbitrary zone plus average elevation plane(main urban construction and development area) are used to establish the urban horizontal control network, which can meet the requirements of the urban control network for length deformation.更多还原