Feature extraction of bathymetric LiDAR waveforms

Wei Tsun Lin, Tian-Yuan Shih

研究成果: Conference contribution同行評審

摘要

Bathymetric Lidarprovidesa practical tool for surveying shallow water zone and the area characterized with navigation threats. The backscatter intensity of laser pulses starting from the emission, and then traveling through air and water, to finally reflected from the bottom, is detectedand recorded. This forms waveform. From the timestamps of feature points in the waveform, the corresponding position and depth can be derived. In thisstudy, the waveforms collected from a Dongsha atoll mission with AHAB Hawkeye II systemare investigated. This system has four receiving channels including two greens, one infra-red and one Raman. Waveforms of different depth, ranging from less than 1m to 40m, are selected for the study. Ensemble Empirical mode decomposition (EEMD) method is used to reduce the noises in the waveform. Weibull distribution is used for fitting the filtered waveform for extracting features. The depths are then derived from the time interval between surface and bottom feature points. The resultis compared with the depth derived from the AHAB Coastal Survey Studio (CSS) software. The moment of laser beam reached water surface could be detected from all these four channels. It is found that there is a time offset among them. This may be caused by the different settings of the detection devices between different channels, such as the length of the signal transmission cable. These offsets certainly should be calibrated in a lab environment.

原文English
主出版物標題33rd Asian Conference on Remote Sensing 2012, ACRS 2012
頁面1360-1365
頁數6
出版狀態Published - 1 12月 2012
事件33rd Asian Conference on Remote Sensing 2012, ACRS 2012 - Pattaya, Thailand
持續時間: 26 11月 201230 11月 2012

出版系列

名字33rd Asian Conference on Remote Sensing 2012, ACRS 2012
2

Conference

Conference33rd Asian Conference on Remote Sensing 2012, ACRS 2012
國家/地區Thailand
城市Pattaya
期間26/11/1230/11/12

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