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Application of LiDAR technology in Vietnam
Dr. Hoang Ngoc LamMSc. Nguyen Thuc Anh
Hanoi, 22 May 2007
MINISTRY OF NATURAL RESOURCES & ENVIRONMENTREMOTE SENSING CENTRE
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Content
Technical details of LiDAR projectsProject workflow & examples from
current projectApplications of LiDAR dataQ & A
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Projects technical details
Cantho: 1.800 km2
July 2006Contractor: AAMHatch
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: Laser points: Clasified Intensity image
Quality control: 390 checking points by GPS RTK along roads RMSE: 0.14m
Vinhlong - Bentre: 2.200 km2
May 2007 Contractor: GeoKosmos
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: ~ 1mDigital camera: Rollei AIC modular LS 22Mp Focal length: 50 mm Scale 1:30.000 Ground resolution: 27 cm
Output: Laser points: Classified Intensity image Simultaneously taken color air-photo
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FINAL PRODUCT
FLIGHT PLAN
FLIGHT PLANNING
ACCURACY IMPROVEMENT
VERTICAL ACCURACY
CHECK
FILTERING
FILTERED LASER POINTS
FINAL DATA & REPORT
FINAL REPORTMETADATA
FINAL QUALITY CHECK
SURVEYING BASE STATIONS
BASE STATIONS
SYSTEM INSTALLATION
CALIBRATIONS
SURVEYING CONTROL AREA FOR
ACCURACY EVALUATION
REFERENCE AREAS REFERENCE AREAS
TERRESTRIAL SURVEY
FLIGHT &GPS BASE STATION
MEASUREMENT
POST-PROCESSING
GPS, IMU, LASER SIGNALS
LASER POINTSX, Y, Z
VISUAL CHECK
LASER ACQUISITIONDIGITAL AIRPHOTO
ACQUISITION
DOWNLOAD FROM AIRCRAFT PHOTO
STORAGE
IMPORT TO “PHASE ONE” SOFTWARE
ADJUSTMENT
CONVERSION TO 16BIT TIFF
Project workflowALTM DATA STORAGE
DOWNLOADING OF RAW FILES
REALM
HARD DISK DECODE
POSPAC:RAW IMU &
AIRBORNE GPS
GPS BASESTATION
MEASUREMENTPOS GPS
POS PROC
RANGE ANGLE
INTENSITY
COMPUTE LASER POINTS
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Vinhlong – Bentre LiDAR projectMay 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
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
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Thank you for your attention!
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