Kiyoko Iwasaki Masayuki Kanbara Kazumasa Yamazawa Naokazu Yokoya Construction of extended geographical database based on photo shooting history. 185-194 2008 CIVR http://doi.acm.org/10.1145/1386352.1386381 conf/civr/2008 db/conf/civr/civr2008.html#IwasakiKYY08