在空三加密过程中，由于人为因素、地物的复杂性、植被及遮盖物等引起的加密点粗差；
In Geolord-AT three-dimensional triangulation process, artificial factors, complexity of surface feature , vegetation and so on cause the encrypted dot rude difference.
最后，把组成地物的所有点认为是同样颜色的点，运用传统的二值图像矢量化方法得到矢量空间数据。
At last, the traditional vectorization method can be used to get spatial vector data regarding all the pixels of the object as the same color pixels.
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