比如，一些投影准确地显示了区域，但是扭曲了距离或比例；其他投影保留了国家的外形但是代表的区域不对。

Some projections show areas accurately but distort distances or scales, for example; others preserve the shapes of countries but misrepresent their areas.

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对投影方式及比例参数设定后，再利用矿区不同的测量已知点与手持GPS接收机测量点坐标进行对比。

Contract the coordinate between different known survey points in mining area and the survey points by GPS receiver after establish the projection mode and scale parameter.

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提出了基于连续比例因子的梯度投影算法。

The gradient projection method based on continuous scale factor is presented.

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