Abstract—InrecentyearstherehavebeenexcellentresultsinVisual-InertialOdometrytechniques,whichaimtocomputetheincrementalmotionofthesensorwithhighaccuracyandrobustness.Howevertheseapproacheslackthecapabilitytocloseloops,andtrajectoryestimationaccumulatesdriftevenifthesensoriscontinuallyre