General GPS data processing software are used in calculating the above steps, only Step 2 involves the conversion parameters. In view of our country have been benchmarks for the use of different coordinates (BJ54, State80, Correct54), around the gravity value, and very different, so it is difficult to determine the accuracy of a better suited to the country and the conversion parameters. Practice is: to find in the work area more than three known points, using the known coordinates and measured coordinates Wgs84, solving seven parameters. If more than a few known points selected by the method of adjustment can be a better accuracy.

WGS84与北京54坐标系之间的转换.doc

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