1. Light Detection and Ranging(LIDAR) BY: SONU SANGAM USN-1C07EC096 BRANCH-ECE SEM -VIII

2. 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 INTRODUCTION

3. 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 General Description

4.  based on backscattering :-  Rayleigh LIDAR  Mie LIDAR  Raman LIDAR Other types:-  Coherent LIDAR(phase sensitive)  Incoherent LIDAR(amplitude measurement) LIDAR TYPES

5.  Integration Of three technologies to produce Digital Elevation Models(DEM) They are:-  Lasers  Global Positioning System(GPS)  Inertial Navigation System(INS) TECHNOLOGIES USED

6.  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 WORKING

7.  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 COMPONENTS

8.  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 Contd…..

9.  Photo detector and receiver electronic  Solid state photo detectors  Silicon avalanche photodiodes  Position and navigation systems  Global Positioning System receiver  Inertial Measurement Unit(IMU) Contd…..

10.  LIDAR-equipped mobile robot  Used for constructing map and avoid obstacle APPLICATIONS

11. 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 Contd….

12. 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 Contd….

13. 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 Contd….

14. 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) Contd….

15. What can we do with LIDAR ?  Measure distance  Measure speed  Measure rotation  Measure chemical composition and concentration LIDAR DATA

16. 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

18. FLOOD RISK MAPPING  Quickest and most accurate method to measure DEM  Easy flood prediction and plan mitigation and remediation strategies OTHER APPLICATIONS

19. 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….

20. 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 Contd….

21. TRANSMISSION LINE MAPPING  Calculating power line heights or sag under different loads  Inventory  Tower Placement  Height of underlying vegetation Contd….

22.  Undersea cable routing  Wreck detection  Charting and safety issues SHOALS-SPECIFIC APPLICATIONS

23.  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 CONCLUSION

24.  www.wikipedia.org www.wikipedia.org  www.lidar.com www.lidar.com  www.ambercore.com www.ambercore.com  www.gisdevelopment.net www.gisdevelopment.net  www.lidarmap.org www.lidarmap.org  www.velodyne.com/lidar/ www.velodyne.com/lidar/ REFERENCES

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