Based on the Helmert Similarity Conversion Principle,a four-parameter conversion method is proposed,which can not only minimize the scale error of projection but also guarantee the minimum difference between the survey points with identical names and the national coordinates.

To estimate ERP parameters, two different ways are involved: one is the parameter transformation, the other is direct adjustment method with restrictive conditions.

For the geometry matching search that appeared in the product configuration design based on case reasoning,the similarity model of geometric attributes denoted in the different ways was put forward,the objective function about parameter transformation was constructed by using the principle of least squares,the 6 unknown variables were solved by adopting the algorithm of bound constraint BFGS.

Using RTK to solve WGS-84 and the discussion of coordinates with the city of transformation parameters

This paper studied and solved the key problems of connection survey,determination of transformation parameters,programming of transformation softw.

If the transformation parameters are solved with the GPS data in a small area,the precision of transformation parameters may be very poor,especially the translation parameters.

Discussion the CPS RTK transformation parameter influences on the plan precision;

The GPS control network and it s transformation parameters of the first stage deep water channel project in the entrance of Yangtze river;

This paper expounds the principle and measuring method of RTK technology, introduces the method and process of calculating conversion parameter between WGS-84 and independent coordinates in Taiyuan, discusses the application of RTK technology in city measuring.

Then we can calculate the rough transfer parameters between the camera station coordinate system and the control coordinate system by the coordinates of three points in two coordinate systems.