2, precise registration: after boundary extraction, with certain constraints, feature registration goes on, and the corners and centers of matched boundaries are chosen as the control points for precise registration of DLG and DOM.

• 2,精配准:边界提取、表达、描述,然后利用唯一性和相容性约束进行边界特征匹配,取匹配边界的角点和中心为配准控制点,进行精配准。