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中文摘要：
针对三维空间和高程未知的二维空间之间的七参数的求解问题，提出一种新方法——高程趋近法，并通过真实数据和模拟数据阐明此方法的可行性和适用范围，得出结论：当经纬度的跨度范围均小于8°时，其x或y方向的坐标差值均在1cm左右，并且其精度随着经纬度（特别是纬度）范围的缩小而显著提高。
英文摘要：
A new method which is called Height Substitution Circular Method is put forward aimed at the solution of the seven-parameter transformation between 3D and 2D spaces with unknown height. The feasibility and the applicability of this method are proved through processing the real data and the simulated data. The results show that when both the ranges of longitude and latitude are less than 8°, both the coordinate differences in x and y direction are about 1 cm and the accuracy is obviously improved with the range reduction of longitude and latitude especially the range reduction of latitude.
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