Conference PaperTravel purpose inference with GPS trajectories, POIs, and geo-tagged social media dataMeng, Chuishi; Cui, Yu; He, Qing; Su, Lu; Gao, Jing2017-12-01100580342017 IEEE International Conference on Big Data1319 to 1324https://doi.org/10.1109/bigdata.2017.82580621637604; 1737590National Science Foundation