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Introduction to LIDAR Mapping Technology: ALSM and Laser Altimetry

Discover the fascinating world of LIDAR technology, including ALSM and laser altimetry systems. Learn how lasers generate amplified electromagnetic radiation, key components like laser pulse generators, photodetectors, and navigation systems. Dive into data processing, flight operations, and post-processing techniques. Explore digital modeling and image production capabilities of laser scanning systems in this comprehensive guide.

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Introduction to LIDAR Mapping Technology: ALSM and Laser Altimetry

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  1. Introduction to LIDAR Mapping Technology LIDAR (Light Detection and Ranging) ALSM (Airborne Laser Swath Mapping) and laser altimetry • LASER (Light Amplification by the Stimulated Emission of Radiation) • Amplified electromagnetic radiation of a specific frequency and wavelength generated by stimulated emission. • The radiation emitted by a laser consists of a coherent beam of photons, all in phase and having the same polarization • Commonly generated in the UV-Visible-IR spectral range

  2. Laser Pulse Generators Airborne topographic mapping lidars - use 1064 nm diode-pumped YAG lasers Bathymetric systems generally use 532 nm diode-pumped YAG lasers Scanner and optics Photodetector and receiver electronics Position and navigation systems Computer System, Memory Management and Data Processing Software

  3. Laser Pulse Reflection T = Two-way Travel time D = distance c = D / (T/2)

  4. Airborne Laser Swaths / Flight Operations • Data Management System • Laser Pulse Generation • Laser Pulse Detection • Post-Processing / Error Corrections • Post-Processing / Data Filtering • Digital Modeling • Image Production

  5. laser scanning systems are capable of emitting up to 100,000 pulses per second

  6. Bainbridge Island, WA Example – 7.5-Min DRG

  7. Bainbridge Island, WA Example – 10 m DEM

  8. Bainbridge Island, WA Example – LIDAR 3.6 m DEM 3.6 m

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