@inproceedings{Hays:2008:im2gps,
  Author    = {James Hays and Alexei A. Efros},
  Title     = {im2gps: estimating geographic information from a single image},
  Booktitle = {Proceedings of the {IEEE} Conf. 
               on Computer Vision and Pattern Recognition ({CVPR})},
  Year      = {2008},
}