APPLICATION OF DIGITAL PHOTOGRAMMETRY FROM UAV...
Transcript of APPLICATION OF DIGITAL PHOTOGRAMMETRY FROM UAV...
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APPLICATION OF DIGITAL PHOTOGRAMMETRY FROM UAV INTEGRATED BY TERRESTRIAL LASER
SCANNING TO DISASTER MANAGEMENT
BRCKO FLOODING CASE STUDY (BOSNIA HERZEGOVINA)
1 - Department of Engineering and Architecture, University of Trieste, Italy2 - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS) Trieste, Italy3 - GeoSNav Laboratory, University of Trieste, Italy
F. Cescutti1, F. Coren2, A. Pavan2, R. Cefalo3, A. Calliari3
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The Brcko District
The Brčko District (Bosnia andHerzegovina) is a neutral, self-governing administrative unit, underthe sovereignty of Bosnia andHerzegovina.
Covered area: 493Km2
Total Population: 93000
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Floodings occurred May 2014
In May 2014 a the torrential rainfall occoured in the Balkan regioncaused extensive flood damages and activated thousands of landslidesdevastating roads, bridges, buildings and other infrastructures.Current scientific information about the subsurface is essential for thereconstruction activities.
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Minesfield problems
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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
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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
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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)
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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
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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
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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
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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
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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
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Locations
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Locations – First landslide
Sparse Point Cloud: 192.418 points
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Locations – First landslide
Dense Point Cloud: 39.744.861 points
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Locations – First landslide
Mesh: 2.565.637 faces
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Locations – First landslide
Mesh texturized
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Locations – First landslide
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Digital Elevation Model
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Camera center position and photogrammetric point density
# overlap
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Ground control points Analysis
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Locations – Second landslide
Sparse Point Cloud: 86.941 points
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Locations – Second landslide
Dense Point Cloud: 20.959.908 points
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Locations – Second landslide
Mesh: 4.191.972 faces
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Locations – Second landslide
Mesh texturized
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Locations – Second landslide
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Digital Elevation Model
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Camera center position and photogrammetric point density
# overlap
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Ground control points Analysis
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Laser scanner data
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Laser scanner data
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Laser scanner data
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Laser scanner and photogrammetric data merging
Laser scanner points : WHITE
Structure from motion (Photo): COLOURED
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Laser scanner and photogrammetric data merging
Laser scanner points : WHITE
Structure from motion (Photo): COLOURED
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Laser scanner and photogrammetric data merging
Laser scanner points : WHITE
Structure from motion (Photo): COLOURED
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RESULTS
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Landslide delimitation
DETACHMENT LIMIT
ACCUMULATION AREAFirst landslide
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Landslide delimitation
DETACHMENT LIMIT
ACCUMULATION AREA
Second landslide
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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
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THANKS
FOR YOUR ATTENTION!