Daisuke Kitayama Ryong Lee Kazutoshi Sumiya A credibility analyzing method of geographical objects from digital maps. 536-543 2009 ICUIMC http://doi.acm.org/10.1145/1516241.1516335 conf/icuimc/2009 db/conf/icuimc/icuimc2009.html#KitayamaLS09