LIDAR

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lidar

LIDAR

Ø LIDAR represents Light Detection and Ranging or LASER RADAR.

Ø LIDAR is not only replacing conventional sensors but also creating new methods with unique properties that could not be achieved before.

HOW IT WORKS

Ø Up to 200,000+ pulses/second

Ø Everything that can be seen from the aircraft is measured
Ø Each time the laser is pulsed:

  • Laser generates an optical pulse
  • Pulse is by object and return and received by receiver
  • High-speed counter measures the time of flight from the start pulse to the return pulse
  • Time measurement is converted to a distance (the distance between the target and the position of the airplane is then used to determine the elevation and location)
  • Multiple returns can be measured for each pulse

RETURN DENSITY

Ø In LIDAR the footprint size decreases with increasing post-spacing and importantly the last return from a discrete return system is not always the ground

Ø LIDAR sensor systems vary in the number of returns from a surface

APPLICATIONS

Ø Digital Elevation Model(DEM)

Ø Geomorphology

Ø Geology

Ø Measuring volume in open pit mines

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