LiDAR data

All LiDAR overflights by drone were performed in June 2022. The LiDAR sensor used was a Yellowscan Surveyor and was embarked on a DJI Matrice 600 Pro UAV. The YellowScan Surveyor includes: - GNSS-inertial station : Applanix APX-15 UAV - LiDAR : Velodyne VLP16 (also known as Puck) : Wavelength: 905 nm / 300,000 pulses per second (300 kHz) / 2 echoes per pulse / Viewing angle: 360° - Accuracy: 4 cm The design of a flight path consists of a double grid with interline distances of 40 m. The drone flew at 50 m height constrained by a 5 m resolution DTM from the BD ALTI® by IGN. The flights were made at a speed of 5 m per second. All trajectories were planned with the UGCS-4.0.134 software. Then, the LiDAR dataset was post-processed in several steps by using different softwares: - Applanix POSPac UAV 8.4: post-processing (PPK) of trajectories based on the UAV's GNSS-Inertial Measurement System data and using a reference GNSS base station. The correction solution for each trajectory is exported in an ASCII SBET (Smoothed Best Estimated Trajectory) file. - Yellowscan CloudStation V2106.0.0: The SBET file is integrated in the software to generate point clouds in .las format projected in RGF93/Lambert 93. - LidR (R package): reading of las files, redrawing into tiles in compressed format .laz file corresponding to the output format. Telepilots from the TETIS resarch unit, Montpellier : Samuel Alleaume and Florian de Boissieu. This dataset includes raw data and derived raster products. The data is provided in a cloud-optimized format (COPC).