通过对离散点进行短线段拟合的基础上，再利用曲线拟合的最小二乘法对圆和直线进行二次拟合。
On the basis of short straight-line fitting, this dissertation USES the least-square method of curve matching to discern circle and straight line.
操作员通过人机界面选择房屋的种类并输入初始位置 ，然后经过边缘检测、直线段提取和据此房屋几何模型的线段自动编组等处理得到各房屋角点的初始位置。
In the semiautomatic extraction system, the building model is defined by selected roof type input through human_machine interface and input points of rough position of the building by operator.
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