application of digital photogrammetry from uav integrated by

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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!

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