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城市测绘基准是“国家—省—地级市”大地基准体系的重要组成部分,既与国家级、省级测绘基准相联系,又有着自己的特点。作为地方性基准,它通过地方坐标系来定义,由城市测绘控制网来实现,是城市各种测绘工作的基础。2008年7月,我国已正式启用CGCS2000坐标系。因此,当前我国城市测绘基准的建设工作主要有以下几个方面:一是构建与城市发展相适应、与CGCS2000相联系的三维空间基准体系,建立既能覆盖整个区域,又能与国家坐标系统形成良好联系的完整、统一、规范和使用方便的相对独立的城市平面坐标系统,统一测绘成果基准,使基础测绘成果的社会效益和经济效益得到
The city mapping datum is an important component of the “national-provincial-prefecture-level city” datum system, which is not only linked with national and provincial surveying and mapping standards but also has its own characteristics. As a local benchmark, it is defined by the local coordinate system and is implemented by the city mapping control network, which is the basis of various surveying and mapping work in the city. July 2008, China has officially opened the CGCS2000 coordinate system. Therefore, at present, the construction work of our country’s urban mapping base mainly includes the following aspects: First, to build a three-dimensional spatial reference system that is compatible with urban development and linked with CGCS2000, and to establish a three-dimensional spatial reference system that can cover both the whole area and the national coordinate system Good contact with a complete, unified, standardized and easy to use relative independence of the city plane coordinate system, unified mapping results benchmarking, so that the basic social surveying and mapping results and economic benefits