Research on Identification and Supervision of Ecological Background of Subtropical Mountainous Highways Based on Multi-source DataMing Zhao, Kai-cheng Hua, Dong Zhang, Dong Ni, Min-min Yuan and Zhao-ming WangE3S Web Conf., 165 (2020) 02021DOI: https://doi.org/10.1051/e3sconf/202016502021