Research and verification of internal and external measurement methods of large oil storage tanks capacity based on 3D lasers canningXianlei Chen, Yexin Xu, Yeyong Wang, Zenan Wu, Junxue Chen, Haolei Shi, Huadong Hao, Zhengqian Shen, Jianhua Ji and Zhanfeng XuE3S Web Conf., 245 (2021) 01053DOI: https://doi.org/10.1051/e3sconf/202124501053