近代历史海图数学基础的转换；浙江海区近代历史海图的平面坐标改正和深度基准面改正。
The transformation on mathematical basis of modern historic chart, the correction of the horizontal coordinate and depth data on the charts for the waters off Zhejiang coast are elaborated.
它们已在浙江海区近代历史海图集的编制中得到应用和验证，并对我国其它海区近代历史海图集的编制具有参考价值。
They have been used and verified in the compilation of modern historic chart atlas of Zhejiang sea area and should have a referential value for other sea areas of China.
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