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中文摘要：
考虑到不同坐标系所定义的几何意义与物理意义之差异以及坐标系间存在局部变形和累积误差，把拟合推估应用于1980西安坐标系到2000国家坐标系的转换中，计算结果表明，基于拟合推估的坐标变换精度明显优于相似变换。
英文摘要：
Because the similarity transformation method applied in practice for coordinate transformation is not so accurate in general to unify different coordinate systems, the collocation method is applied for coordinate transformation from the 1980 Xi＇ an coordinate system to 2000 Chinese geodetic coordinate system and the local error accumulation and distortion are considered in the collocation method. The computed result of an actual sample shows that the accuracy of transformed coordinates is evidently improved with the collocation method than with the similarity transformation method.
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