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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!