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AIRBORNE LASER (LiDAR)AIRBORNE LASER (LiDAR)
SYSTEMSYSTEM
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LiDAR acronym for Light Detection andRanging
A method of detecting distant objects anddetermining their
position, velocity, or othercharacteristics by analysis of pulsed
laserlight reflected from their surfaces
LiDAR carries own sources of laser lightwhich capable to measure
day and night.
Can be used for wide variety of tasks andideal for agricultural
planning, miningsurvey, river catchments survey and
floodmapping.
Provides value beyond conventional surveywithout time
constraint.
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1. Aerial Platform
2. GPS - Air System
3. GPS Ground
4. Inertial System
5. Laser
6. Camera
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1 Laser Com onent
Measure up to 200 000 laser pulses per second(or more) at a
mirror scan angle of up to 20degrees either side of the
vertical.
Measure the first and last reflection.
pera ng e g s range rom m o mabove ground, resulting in a single
swathecoverage ranging from 70m to 2000m.
2 GPS Component
Consists of two ground based duel frequencyGPS receivers and one
air GPS receiver.
3) Navigational Component ons sts o a ase m ss on contro
system
that supplies the necessary navigationinformation in a graphical
interface to both theoperator and the pilot.
4) Digital Imaging Component
Consists of Kodak DCS 420 or Hasselblad digitalcameras
controlled by an onboard computer.
Stores overlapping images in 24-bit color on a.
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DATA ACQUISITION
DATA PROCESSING
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FLIGHTPLANNING
DETERMINE FLYINGHEIGHT & SPEED
LASER PULSERATE
SWATHWIDTH
MIRRORSPEED
CAMERA ORIENTATION& EXPOSURE INTERVAL
GROUND CONTROL
VERIFICATION & CALIBRATIONSATISFIED
FIXED ON AIRCRAFT /
EQUIPMENT CALIBRATION
LIDAR AND DIGITAL IMAGERY
DATA ACQUISITION
GPS SURVEY
AT GROUND BASESIMULTENOUSLY
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Positional Satellite
LiDAR &
Digital Imagery
Data Captured
Ground Control
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DATA PROCESSING
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Point_31
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DTM ModelDTM ModelImageryImagery
ORTHOPHOTO and INTENSITY IMAGE Product
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5m Contour5m ContourDTM_PointDTM_Point
DTM and CONTOUR Product
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Intensity Image Product
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Laser points at accuracy of X and Y 0.05 to 0.1meters de end on
distance from GPS BaseStation) and Z 15 cm to 1m depending
onterrain type and vegetation covers.
ro uces or op o os w a p xe s ze o o20cm at 1,000m flying height
or 5cm at 200mflying height.
Imagery accuracy of 0.2m and are primarily usedfor identifying
detail.
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5. CONCLUSION5. CONCLUSION
The LiDAR Survey system is the best solution for fulfill
thetopographic data with high accuracy data result.
The LiDAR survey system is also more efficient and cheaper if
we
compare with conventional survey system.
The LiDAR survey system is suitable for big and large area
survey and
big mapping scale.
The LiDAR survey system has good data result with 0.3m to
1.0m
point spacing on the clear area and 5.0m to 10.0m point spacing
on. ,
reserve volume calculation and mine design for short term and
long
term planning.
The system can decrease of human accident, equipment damages
andenvironment destruction.
The terrestrial survey system is still can be use for the small
area
survey.
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