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关于三维城市景观实体准确测量优化建模仿真

摘要 对三维城市景观实体的准确测量,能够有效提高城市景观规划精度。对城市景观实体的准确测量建模,需要给出坐标系之间的平移和旋转关系,对畸变的成像点进行校正,完成对城市景观实体的测量建模。传统方法给出摄像机标定参数,组建三维城市景观实体模型,但忽略了对畸变的成像点进行校正,导致景观实体测量精度偏低。提出基于数字测量的三维城市景观实体模型构建方法。依据三维城市景观图像对之间的关系组建一个交会模型,得到城市景观地物点坐标,给出摄像坐标系和世界坐标系之间存在的平移和旋转关系,对畸变的成像点进行校正,得到校正后的城市景观实体三维重建点,由此组建三维城市景观实体模型。实验结果证明,所提模型具有精度高和速度快等特点,为建设数字城市提供了可行的依据。 The accurate measurement of three-dimensional urban landscape entity can effectively improve the planning accuracy. In traditional methods, the correction of distorted imaging points is ignored, which leads to the low precision of measurement. A modeling method of three-dimensional urban landscape entity based on digital measurement is proposed. Based on relationship between image pairs of three-dimensional city landscape, a rendezvous model is established to get the coordinate of surface feature point of urban landscape. Then, the translation and rotation relation between the camera coordinate system and world coordinate system is given. The distorted imaging point is corrected to obtain the three-dimensional reconstruction point of urban landscape entity after correction, thus forming the entity model of three-dimensional city landscape. Simulation results show that the proposed model has high accuracy and high speed, which provides a feasible basis for building digital city.



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