The influence of different water condition on the returned signal of Airborne LiDAR Bathymetry(ALB)
Date Issued
2015
Date
2015
Author(s)
Cheng, Huei-Yi
Abstract
Airborne LiDAR bathymetry systems (ALB) fire laser pulses and receive returned waveforms to detect water bottom and surface, thus determining the water depth. Received waveforms may be influenced by hardware configurations, water surface condition, and water content. The quality of water-depth measurement is confined to the received waveforms and the algorithms used to decompose the waveforms and determine the water depth. This study aims at generating and analyzing the waveforms by taking hardware, software components and water surface and content into full consideration. The simulated waveforms can be made by tuning the instrumental, geometric, and environmental factors influential to the determination of the water depth. The Monte Carlo method is employed to govern the events of transmission, scattering, absorption, and reflection on both geometric and radiometric intersections in relation to the confronted water content. The main contribution of this research is to quantitatively evaluate how the measured water depth quality is affected by different water condition and instrumental setting. Thus the optical properties of water in various content can be better appreciated and well treated when carrying out water depth measurement through ALB.
Subjects
Airborne LiDAR Bathymetry
Monte Carlo method
returned waveform
the optical properties of water
Type
thesis
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