LiDAR (Light Detection and Ranging) is an active remote sensing system using a laser beam to obtain data on topographic characteristics of the ground surface in horizontal and vertical positions. LiDAR technology in geospatial industry has been widely applied by industrial surveyors as well as academics, like a research previously initiated by Gadjah Mada University (UGM) entitled ‘Deformation Monitoring and 3D Digital Documentation of Prambanan Temple for Disaster Mitigation and Restoration of Cultural Heritage Buildings’ (31/8).
LiDAR data acquisition by Microdrones mdLiDAR1000 started by creating flight mission using mdCockpit software. The plan was to collect data within an area of ± 10 ha by flying with the speed of 3 m / s and 60 meters flight altitude. Side lap between flight routes (lateral overlap) was set to 60%, with 60 ° field of view. Total flight duration was 20 minutes, consuming 1x battery of 16000 mAh.
Only 1 base station required by this mission used as a GPS benchmark. GPS embedded in the md4-1000 provided position and time information to the LiDAR system. mdLiDAR1000 is also equipped with APX-15, INS, and IMU (Inertial Measurement Unit) which functioning as orientation sensor of the LIDAR system; roll, pitch, and heading (yaw). With such flight setting / configuration, 19,500 points per second pulse rate with an average point density of 90 pts / m2 can be collected by one flight.
Microdrones used POSPac™ UAV and mdLiDAR Processing Software for data processing. By using this user friendly data processing software, 6 cm of accuracy was achieved for the X, Y, and Z. 10 lines of LiDAR data with the format (.las) were generated to produce 3D modeling of Prambanan Temple.