Research on the Control Point Extraction Method of Chinese Gaofen 7 Satellite Using Altimeter and Footprint CameraBinbin Li, Huan Xie, Xiaohua Tong, Yinqiao Cai and Zhijie ZhangEPJ Web Conf., 237 (2020) 01016DOI: https://doi.org/10.1051/epjconf/202023701016