The Prediction Model of Influence of Small Radius UTLT Curvature on Fire Site Visibility Based on Pyrosim Multiple Regression AnalysisXiao Ju Li, Kun Yao, Jun Yu Dai and Yun Long SongE3S Web Conf., 79 (2019) 02013DOI: https://doi.org/10.1051/e3sconf/20197902013