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Study on the pivotal technologies of the update of urban control network

LI Chun-hua②, ZHANG Ying②,LUO Xian-mao②,HUANG Ding-fa(Southwest Jiaotong University, Chengdu 610031; ②ChengDu City Institute of Surveying and Investigation, Chengdu 610081)  
Taking the update of the urban control network in Chengdu city as an example, this paper has introduced a solution to this upgrade and its pivotal technologies including the transform of reference framework, the correction of length distortion, the establish of Continuously Operation Reference Station(CORS) and the refining quasi-geoid.It is helpful for the construction and update of the urban control network in large and medium sized cities.
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