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My Opinion for Establishing Regional Coordinate System

Shi Yimin (Tongji University, Shanghai, 200092)  
In this paper, the essentence of regional coordinate system for urban and engineering control networks were discussed, several weaknesses of the method for establishing level surface with compensation were pointed out, especially in cases of large scale or high precision control networks. Compared with this method, the method for translating central meridian is much more applicable in many cases. The adopting of the new determined ellipsoidal surface is necessary to applying of GPS technique, but the existing determination for ellipsoidal surface will be improved.
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