The results are also compared with state-of-the-art text-based methods based on a flat<cite> (Rahimi et al., 2015b</cite>; Cha et al., 2015) or hierarchical (Wing and Baldridge, 2014; Melo and Martins, 2015; Liu and Inkpen, 2015) geospatial representation. Our method outperforms both the flat and hierarchical text-based models by a large margin.