澎湖與東沙環礁測深光達作業探討

On The 2010 Bathymetric Lidar Survey of Penghu and Dongsha Atoll

史天元(Tian-Yuan Shih) ； 薛憲文(Shiahn-Wern Shyue) ； 蕭輔導(Fu-Daw Hsio) ； 陳雅信(Ya-Hsing Chen) ； 徐佳筠(Chai-Yung Hsu) ； 陳杰宗(Jie-Chung Chen) ； 陳佳勳(Jia-Hsun Chen)

《航測及遙測學刊》 16卷3期 (2012/08) Pp. 151-166

https://doi.org/10.6574/JPRS.2012.16(3).1

摘要

空載測深光遠（Bathymetric Lidar，或稱遠水光達），以航空器為載具，載運雷射掃瞄儀，進行水域水底地形測量之系統。掃瞄儀所使用之雷射光，為具穿透水體能力之綠光波段。為引進空載測深光達作業技術，並獲取東沙環礁之水底地形資料，內政部於民國九十七年規劃澎湖及東沙環礁地區測量專案，並委由交通大學執行。本次測量採用AHAB HawkEye II系統，以Swearingen SA-226T航空器為載具，於民國99年8至9月間進行。實際完成東沙環礁約500平方公里，澎湖地區逾400平方公里之飛行測量。測量點間距（Nominal Point Space, NPS）約為3.5公尺。並擇定環礁東部約20平方公里區域，以較低航高獲取點間距2公足之點雲。載資料品質管控工作上除了進行交叉航線及重疊航線之檢核外，並以船載聲納作業進行外部精度檢核，所獲取資料精度皆達國際海道測量組織（International Hydrographic Organization，IHO）規範之一等要求。本文依據本計畫之作業經驗，整理描述飛航過程、資料編修處理、精度驗證、及產製成果等階段工作，並分析各階段之重要關鍵，期為未來相關工作之參考。

關鍵字

全波形 ； 航空測量

並列摘要

Airborne Bathymetric Lidar systems utilize aircraft as the platform performing laser scan for surveying the underwater topography. The spectral band used for this laser is green, which can penetrate water and backscattered on the sea floor. This technology is best suited for area characterized as shallow and low water turbidity. Comparing with sonar based methods, airborne laser hydrography is featured with high efficiency and particularly suitable for areas with shoals and other risks for navigation. In order to fully utilize advanced technology for bathymetric mapping in Taiwan, and collect the bathymetric information of Dongsha atoll, Ministry of Interior planned a surveying project in 2008 for mapping Dongsha atoll and Penghu. This project is granted to National Chiao Tung University for execution. The aerial survey was performed with an AHAB Hawkeye II lidar system installed on a SA-226 aircraft, in August and September of 2010. 500 square kilometers in Dongsha, and about 400 square kilometers in Penghu were surveyed at spatial density of 3.5 meter by 3.5 meter. An area of 20 square kilometers located in the east portion of the atoll is surveyed with 2x2 meter resolution at lower flying height. Both cross flight and overlaps are compared for quality control. Sonar survey is also conduction for further validation. The survey result meets the IHO 1b specification. This article reviews the aerial surveying, data acquisition and editing, accuracy assessment and validation. The critical issues are discussed for the reference of future development and application of airborne bathymetric lidar in Taiwan.

並列關鍵字

Full waveform ； aerial survey