Transcript Application of LiDAR technology in Vietnam

MINISTRY OF NATURAL RESOURCES
& ENVIRONMENT
REMOTE SENSING CENTRE
Application of LiDAR technology
in Vietnam
Dr. Hoang Ngoc Lam
MSc. Nguyen Thuc Anh
Hanoi, 22 May 2007
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Content
 Technical details of LiDAR projects
 Project workflow & examples from
current project
 Applications of LiDAR data
Q & A
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Projects technical details
Cantho: 1.800 km2
July 2006
Contractor: AAMHatch
Vinhlong - Bentre: 2.200 km2
May 2007
Contractor: GeoKosmos
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LiDAR system: ALTM 3100 C
Airplane:
ANTONOV 2
Flying speed:
180 km/h
Flying altitude:
1500m
Strip side-overlap: 25%
GPS frequency:
1 Hz
INS frequency:
200 Hz
Scan frequency:
70 Hz
Laser repetition rate:
70kHz
 Output:
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Laser points: Clasified
Intensity image
 Quality control:
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390 checking points by GPS RTK along roads
RMSE: 0.14m
LiDAR system: ALTM 3100 C
Airplane:
ANTONOV 2
Flying speed:
180 km/h
Flying altitude:
1500m
Strip side-overlap: 30%
GPS frequency:
1 Hz
INS frequency:
200 Hz
Scan frequency:
70 Hz
Laser repetition rate:
70kHz
Scale angle: 25
Point density: ~ 1m
Digital camera: Rollei AIC modular LS 22Mp
 Focal length: 50 mm
 Scale 1:30.000
 Ground resolution: 27 cm
 Output:
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Laser points: Classified
Intensity image
Simultaneously taken color air-photo
FLIGHT PLANNING
FLIGHT PLAN
Project workflow
SURVEYING
BASE STATIONS
SYSTEM
INSTALLATION
BASE STATIONS
CALIBRATIONS
ALTM DATA
STORAGE
SURVEYING
CONTROL AREA FOR
ACCURACY EVALUATION
TERRESTRIAL
SURVEY
REFERENCE AREAS
REFERENCE AREAS
FLIGHT &
GPS BASE STATION
MEASUREMENT
LASER ACQUISITION
DIGITAL AIRPHOTO
ACQUISITION
GPS, IMU,
LASER SIGNALS
DOWNLOAD FROM
AIRCRAFT PHOTO
STORAGE
DOWNLOADING
OF RAW FILES
POST-PROCESSING
REALM
IMPORT TO “PHASE ONE”
SOFTWARE
LASER POINTS
X, Y, Z
ADJUSTMENT
VISUAL CHECK
CONVERSION TO 16BIT
TIFF
POSPAC:
RAW IMU &
AIRBORNE GPS
VERTICAL
ACCURACY
CHECK
HARD DISK
DECODE
ACCURACY
IMPROVEMENT
FILTERING
GPS
BASESTATION
MEASUREMENT
POS GPS
FILTERED LASER
POINTS
RANGE
ANGLE
INTENSITY
FINAL DATA &
REPORT
FINAL
QUALITY
CHECK
FINAL PRODUCT
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FINAL REPORT
METADATA
POS PROC
COMPUTE
LASER POINTS
Vinhlong – Bentre LiDAR project
May 2007
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Laser acquisition:
Project design & GPS basestation
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Laser acquisition
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Post-processing:
REALM: Strip trajectory
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Post-processing:
PosPac: Estimated error & RMSE
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Filtering: TerraScan
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Quality control
1053 ground control points by GPS RTK
Preliminary results: RMSE = 0.12 m
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Outputs: Laser points
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Outputs:
Laser points with airphoto
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Outputs:
Laser points with airphoto
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Applications
 High resolution DEM generation:
Integrated GIS for Mekong delta
regional development
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Applications
 3D city model and
urban management
applications
 DSM generation &
Wireless
communication
management
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Applications:
3D model with airphoto
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Applications:
3D model with airphoto
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Applications:
3D model with airphoto
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Other applications
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Civil engineering & Infrastructure development
Corridor mapping
Spatial planning
Forestry applications
Flood monitoring
Landslide monitoring
Erosion monitoring
Coastline monitoring
Irrigation management
Coastline analysis and protection
Volumetric studies
Geomorphology & archeology
Thank you for your attention!
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