中文摘要：

提出了一种指导三维空间基准转换公共点选取的新方法有效——面积分析法,验证了选取不同公共点对平面坐标转换精度的影响,建立了有效面积与坐标转换精度的联系。为了验证该方法的可行性,采用两组真实数据进行了实验,并对实验结果进行了验证。

英文摘要：

This paper proposes an effective area analysis method to guide the selection of common points in 3Ddatum transformation.This method demonstrates that choosing different common points will affect the accuracy of coordinate transformation,and establishes a contact between effective area and conversion accuracy.In order to demonstrate the feasibility of this method,this paper uses two groups of real data to test and the conclusions are drawn.