“…Some existing technologies have already achieved indoor two-dimensional (2D) localization, for example, visual features [ 9 ], Light Detection and Ranging (LiDAR) [ 10 , 11 ], and wireless localization [ 12 ]. However, with the advancement of indoor three-dimensional (3D) localization sensor technology, emerging services like indoor drone control [ 2 , 13 ], virtual reality (VR) [ 14 , 15 ], or augmented reality (AR) [ 16 ] experiences demand higher accuracy in location. They also require more stringent height estimation and more frequent updates of information [ 17 , 18 ].…”