基于无人船和机载LiDAR的大范围河网地形测量研究

Research on Large-scale Hydrographic Net Topographic Survey Based on Unmanned Ship and Airborne LiDAR

精准的河道地形数据是河道管理和防洪防汛的重要基础地理信息数据之一。针对广州市南沙区全区河网纵横交错、水浅、河道窄、浅滩多、河堤周围地物多等特点,本文提出了基于GZCORS的无人测量船和机载LiDAR相结合的立体测量方法,实现河道水上、水下测量的无缝衔接,并进行了精度评定。结果表明,本文提出的方法不仅可以满足河道1∶500地形图测量的精度要求,还提高了大范围河网的测量效率和水上水下一体化数字成果的准确性与专业性。

Accurate riverway topographic data is one of the important basic geographic information data for river management and flood prevention.Aiming at the characteristics of the hydrographic net in Nansha district of Guangzhou,such as criss-crossing,shallow water,narrow river course,massive shoals,and many surface features around river embankment,a stereo measurement method based on GZCORS unmanned measurement ship and airborne LiDAR is proposed to realize the seamless connection of above water and underwater measurement with accuracy assessment.The results show that the method proposed in this paper can not only meet the accuracy requirements of 1∶500 topographic map of river course measurement,it also improves the measurement efficiency and the accuracy and specialization of the digital results of the integration of above water and underwater.