The group meeting of Week 3 of MAGIC Lab was held online on March 19th, 2020. Yunting Miao reported her work. The topic was "Research on the trajectory data rectification mothod of floating car on urban roads —— A hidden Markov model-based map map-matching approach". Participants in this report included Professor Ma Wanjing, Assistant Professor Wang Ling, Assistant researcher Yu Chunhui and other members of MAGIC Lab.