关键词：移动设备；手机；定位算法；GPS
摘 要：This is particularly true in urban environments where tall buildings block satellite view for GPS, and distortions in Earth’s magnetic field from power lines adversely affect compass readings.In this thesis, we describe an image based  localization  algorithm  for  estimating  the  pose  of  cell  phones  in  urban  environments.  This  is motivated by the fact that most of today’s cell phones are equipped with cameras whose imagery can be matched against an  image database for  localization purposes.