Altitude Correction of an UAV Assisted by Point Cloud Registration of LiDAR Scans Topics: Drones and Internet of Things for Surveillance; Engineering Applications; Engineering Applications on Robotics and Automation; Guidance, Navigation and Control; Information-Based Models for Control; Sensors Fusion; Vision, Recognition and Reconstruction In Proceedings of the 18th International Conference on Informatics in Control, Automation and Robotics ICINCO - Volume 1, 485-492, 2021