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application of digital photogrammetry from uav integrated by
APPLICATION OF DIGITAL PHOTOGRAMMETRY FROM UAV INTEGRATED BY TERRESTRIAL LASER SCANNING TO DISASTER MANAGEMENT BRCKO FLOODING CASE STUDY (BOSNIA HERZEGOVINA) F. Cescutti1, F. Coren2, A. Pavan2, R. Cefalo3, A. Calliari3 1 - Department of Engineering and Architecture, University of Trieste, Italy 2 - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS) Trieste, Italy 3 - GeoSNav Laboratory, University of Trieste, Italy The Brcko District The Brčko District (Bosnia and Herzegovina) is a neutral, selfgoverning administrative unit, under the sovereignty of Bosnia and Herzegovina. Covered area: 493Km2 Total Population: 93000 Floodings occurred May 2014 In May 2014 a the torrential rainfall occoured in the Balkan region caused extensive flood damages and activated thousands of landslides devastating roads, bridges, buildings and other infrastructures. Current scientific information about the subsurface is essential for the reconstruction activities. Minesfield problems Survey target TOPOGRAPHIC 3D RECONSTRUCION LANDSLIDE PATTERN RECOGNITION AND DELIMITATION TOPOGRAPHY SUPPORT TO THE GEOPHYSICAL SURVEYS (SEISMIC AND GEOELECTRIC) ORTHOPHOTO PLANE GENERATION RECOGNITION OF THE MORPHOLOGICAL LANDSLIDE ELEMENTS EVALUATION OF DAMAGES The Team and the Financing PROJECT LEADERS Professor Snezana Komatina (University of Belgrade,Serbia)Team Leader Dr. Koya Suto, Dr Jun Sugawara (Terra Australis Geophysica, Australia) Professor Milovan Urosevic (Curtin University, Australia) Dr. Franco Coren (OGS, Italy) Professor Alireza Malehmir (Uppsala University, Sweden) FINANCIAL SUPPORT SEG – SOCIETY OF EXPLORATION GEOPHYSICISTS GEOPHYSICIST WITHOUT BORDERS Systems LASER SCANNER RIEGL VZ400 Integrated GPS receiver (L1) Internal 32Gbytes flash memory Range 350m (speed mode) Range 600m (long range mode) 122000 meas/sec (speed mode) 42000 meas/sec (long range mode) Systems Drone class 650 Flight control board: APM 2.6 with GPS ublox neo-7m Battery: LiPo 4s 4000mha Flight time: 15min @ max TOW TOW: 2500g with 2 cameras Systems Drone class 250 Flight control board: NAZE32 (NO GPS) Battery: Lipo 3s 1500mha First person view sistem (downlink video) Flight time: 5-6min @ max TOW TOW: 650g with 1 camera Systems Canon Powershot A2200 (modified) Fixed focal lenght 5.00mm CHDK firmware, UAV Exposure Control Script Sensor: 14.1 Mpix, 1/2.3" CCD Power: lithium-ion battery Weight: 110g Systems THE DRONE CLASS 650 WAS OUR FIRST CHOICE, DUE TO THE HIGH PERFORMANCE AND (APPARENTLY) THE RELIABILITY OF THIS SYSTEM DUE TO A ELECTRONIC FAILURE AFTER A FIRST TEST MISSION WE HAD TO WITHDRAW THIS SYSTEM IN FAVOUR OF OUR CLASS 250 DRONE THEREFORE ALL THE MISSIONS HAVE BEEN ACCOPLISHED WITH THE 250 CLASS SYSTEM THIS PRINCIPALLY IMPLIED THAT WE HAD TO FLY VISUALLY IN FIRST PERSON VIEW (VIDEOTRASMITTING TO THE GROUND) NO AUTONOMOUS FLIGHT WAS POSSIBLE Processing steps LASER SCAN DATA GEOLOCATION BASED ON GROUND CONTROL POINTS PHOTOGRAMMETRIC PROCESSING OF DRONE IMAGES GEOLOCATION OF DIGITAL ELEVATION (SURFACE) MODEL DERIVED BY DRONE IMAGES MATCHING BETWEEN LASER SCAN DATA AND DTM DERIVED FROM DRONE DATA GROUND CLASSIFICATION OF THE INTEGRATED DATASET Locations Locations – First landslide Sparse Point Cloud: 192.418 points Locations – First landslide Dense Point Cloud: 39.744.861 points Locations – First landslide Mesh: 2.565.637 faces Locations – First landslide Mesh texturized Locations – First landslide Digital Elevation Model Camera center position and photogrammetric point density # overlap Ground control points Analysis Locations – Second landslide Sparse Point Cloud: 86.941 points Locations – Second landslide Dense Point Cloud: 20.959.908 points Locations – Second landslide Mesh: 4.191.972 faces Locations – Second landslide Mesh texturized Locations – Second landslide Digital Elevation Model Camera center position and photogrammetric point density # overlap Ground control points Analysis Laser scanner data Laser scanner data Laser scanner data Laser scanner and photogrammetric data merging Laser scanner points : WHITE Structure from motion (Photo): COLOURED Laser scanner and photogrammetric data merging Laser scanner points : WHITE Structure from motion (Photo): COLOURED Laser scanner and photogrammetric data merging Laser scanner points : WHITE Structure from motion (Photo): COLOURED RESULTS Landslide delimitation First landslide ACCUMULATION AREA DETACHMENT LIMIT Landslide delimitation Second landslide ACCUMULATION AREA DETACHMENT LIMIT RESULTS EVEN THOUGH WE OPERATED WITH A SMALL DRONE WITHOUT GPS AIDED FLIGHT, THE MISSION HAS BEEN COMPLETELY ACCOMPLISHED WITH THE REQUESTED ACCURACY THE INTEGRATION BETWEEN LASER SCAN DATA (FROM THE GROUND) AND DRONE PHOTOS, PRODUCED A DIGITAL TERRAIN MODEL WITH HIGH RESOLUTION AND ACCURACY THE CAPABILITY OF THE DRONE TO FLY OVER MINED AREAS HAS BEEN DEMONSTRATED THANKS FOR YOUR ATTENTION!
