30-04-2011, 10:56 AM
PRESENTED BY:
SONU SANGAM
Light Detection and Ranging(LIDAR).pptx (Size: 848.64 KB / Downloads: 307)
Light Detection and Ranging(LIDAR)
INTRODUCTION
What is LIDAR ?
Remote sensing technology
Uses much shorter wavelength of EM spectrum
Measures properties of scattered light
Measures time delay between transmitted and reflected signals
Highly sensitive to aerosols and cloud particles
General Description
LIDAR vs RADAR
LIDAR uses much shorter wavelength of UV,visible and near IR range
LIDAR is highly sensitive to non-metallic objects
LIDAR has very narrow beam which produces high resolution
LIDAR TYPES
based on backscattering :-
Rayleigh LIDAR
Mie LIDAR
Raman LIDAR
Other types:-
Coherent LIDAR(phase sensitive)
Incoherent LIDAR(amplitude measurement)
TECHNOLOGIES USED
Integration Of three technologies to produce Digital Elevation Models(DEM)
They are:-
Lasers
Global Positioning System(GPS)
Inertial Navigation System(INS)
WORKING
Laser produces optical pulse
Pulse is transmitted , reflected and returned to the receiver
Receivers accurately measures the travel time
X,Y,Z ground coordinates can be calculated using :-
Laser range
Laser scan angle
Laser Position from GPS
Laser orientation from INS
COMPONENTS
Laser:
600-1000nm lasers used for non-scientific application
Inexpensive
Easily absorbed by eye
1500nm lasers
less advanced, longer range , lower accuracy
Eye safe at much higher power level
Used in military application
Scanner
Used to scan the objects , azimuth and elevation
Uses :-
Dual oscillating plane mirror
Combination of polygon mirror
Dual axis scanner
Optics
They affect angular resolution and range
To Collect return signal it uses :-
Hole mirror
Beam splitter
Photo detector and receiver electronic
Solid state photo detectors
Silicon avalanche photodiodes
Position and navigation systems
Global Positioning System receiver
Inertial Measurement Unit(IMU)
APPLICATIONS
LIDAR-equipped mobile robot
Used for constructing map and avoid obstacle
ARCHAEOLOGY
Creates high resolution Digital Elevation Models
Aiding in planning of field campaigns and forest canopy
Provides an overview of broad continuous indistinguishable feature
GEOLOGY
Aircraft based LIDAR
Detect fault and measure uplift
Monitors glaciers
Meteorology and Atmospheric Environment
Used for studies of atmospherics conditions , structures , clouds and aerosols.
Used for measurement of atm. gas
Used for measuring the concentration of atm. gases
Measures wind speed
PHYSICS AND ASTRONOMY
Measure the distance to reflectors placed on the moon
Used in Mars-Orbiting Satellite to produce precise global topographic survey of Mars
Used to detect snow in Mars atmosphere
Used to measure molecular density
MILITARY AND LAW ENFORCEMENT
Used in traffic speed enforcement for vehicle speed measurement
Uses the principle of time of flight to calculate speed
Able to find the vehicle speed from cluster traffic situation
Higher resolution system collect detail to identify targets (tanks)
LIDAR DATA
What can we do with LIDAR ?
Measure distance
Measure speed
Measure rotation
Measure chemical composition and concentration
CAPTURE OF ELEVATION POINTS
Collects only elevation data
GPS antenna is mounted on
upper fuselage
GPS sensors records the data
Data are downloaded and
processed
X,Y,Z coordinates are found
OTHER APPLICATIONS
FLOOD RISK MAPPING
Quickest and most accurate method to measure DEM
Easy flood prediction and plan mitigation and remediation strategies
OIL & GAS EXPLORATION SURVEYS
Provide high speed data acquisition and limit ground intervention
Done using either a fixed wing or helicopter mounted LIDAR system
Contd….
ENGINEERING/CONSTRUCTION SURVEY
Using DEM cut and fill quantities can be more precisely estimated
Time delay between data acquisition and delivery is very less
Air bourn LIDAR provide a cost effective and quick surveys for real estate development
TRANSMISSION LINE MAPPING
Calculating power line heights or sag under different loads
Inventory
Tower Placement
Height of underlying vegetation
SHOALS-SPECIFIC APPLICATIONS
Undersea cable routing
Wreck detection
Charting and safety issues
CONCLUSION
It has allowed data to be collected that was difficult or impossible to obtain prior to its introduction.
Data collection and its processing is relatively fast
LIDAR saves clients money
LIDAR offers flexibility
LIDAR is unobtrusive and environmentally friendly
SONU SANGAM
Light Detection and Ranging(LIDAR).pptx (Size: 848.64 KB / Downloads: 307)
Light Detection and Ranging(LIDAR)
INTRODUCTION
What is LIDAR ?
Remote sensing technology
Uses much shorter wavelength of EM spectrum
Measures properties of scattered light
Measures time delay between transmitted and reflected signals
Highly sensitive to aerosols and cloud particles
General Description
LIDAR vs RADAR
LIDAR uses much shorter wavelength of UV,visible and near IR range
LIDAR is highly sensitive to non-metallic objects
LIDAR has very narrow beam which produces high resolution
LIDAR TYPES
based on backscattering :-
Rayleigh LIDAR
Mie LIDAR
Raman LIDAR
Other types:-
Coherent LIDAR(phase sensitive)
Incoherent LIDAR(amplitude measurement)
TECHNOLOGIES USED
Integration Of three technologies to produce Digital Elevation Models(DEM)
They are:-
Lasers
Global Positioning System(GPS)
Inertial Navigation System(INS)
WORKING
Laser produces optical pulse
Pulse is transmitted , reflected and returned to the receiver
Receivers accurately measures the travel time
X,Y,Z ground coordinates can be calculated using :-
Laser range
Laser scan angle
Laser Position from GPS
Laser orientation from INS
COMPONENTS
Laser:
600-1000nm lasers used for non-scientific application
Inexpensive
Easily absorbed by eye
1500nm lasers
less advanced, longer range , lower accuracy
Eye safe at much higher power level
Used in military application
Scanner
Used to scan the objects , azimuth and elevation
Uses :-
Dual oscillating plane mirror
Combination of polygon mirror
Dual axis scanner
Optics
They affect angular resolution and range
To Collect return signal it uses :-
Hole mirror
Beam splitter
Photo detector and receiver electronic
Solid state photo detectors
Silicon avalanche photodiodes
Position and navigation systems
Global Positioning System receiver
Inertial Measurement Unit(IMU)
APPLICATIONS
LIDAR-equipped mobile robot
Used for constructing map and avoid obstacle
ARCHAEOLOGY
Creates high resolution Digital Elevation Models
Aiding in planning of field campaigns and forest canopy
Provides an overview of broad continuous indistinguishable feature
GEOLOGY
Aircraft based LIDAR
Detect fault and measure uplift
Monitors glaciers
Meteorology and Atmospheric Environment
Used for studies of atmospherics conditions , structures , clouds and aerosols.
Used for measurement of atm. gas
Used for measuring the concentration of atm. gases
Measures wind speed
PHYSICS AND ASTRONOMY
Measure the distance to reflectors placed on the moon
Used in Mars-Orbiting Satellite to produce precise global topographic survey of Mars
Used to detect snow in Mars atmosphere
Used to measure molecular density
MILITARY AND LAW ENFORCEMENT
Used in traffic speed enforcement for vehicle speed measurement
Uses the principle of time of flight to calculate speed
Able to find the vehicle speed from cluster traffic situation
Higher resolution system collect detail to identify targets (tanks)
LIDAR DATA
What can we do with LIDAR ?
Measure distance
Measure speed
Measure rotation
Measure chemical composition and concentration
CAPTURE OF ELEVATION POINTS
Collects only elevation data
GPS antenna is mounted on
upper fuselage
GPS sensors records the data
Data are downloaded and
processed
X,Y,Z coordinates are found
OTHER APPLICATIONS
FLOOD RISK MAPPING
Quickest and most accurate method to measure DEM
Easy flood prediction and plan mitigation and remediation strategies
OIL & GAS EXPLORATION SURVEYS
Provide high speed data acquisition and limit ground intervention
Done using either a fixed wing or helicopter mounted LIDAR system
Contd….
ENGINEERING/CONSTRUCTION SURVEY
Using DEM cut and fill quantities can be more precisely estimated
Time delay between data acquisition and delivery is very less
Air bourn LIDAR provide a cost effective and quick surveys for real estate development
TRANSMISSION LINE MAPPING
Calculating power line heights or sag under different loads
Inventory
Tower Placement
Height of underlying vegetation
SHOALS-SPECIFIC APPLICATIONS
Undersea cable routing
Wreck detection
Charting and safety issues
CONCLUSION
It has allowed data to be collected that was difficult or impossible to obtain prior to its introduction.
Data collection and its processing is relatively fast
LIDAR saves clients money
LIDAR offers flexibility
LIDAR is unobtrusive and environmentally friendly