頁籤選單縮合
題名 | 利用MODIS影像推估臺灣沿岸海水透視度=Using MODIS Imagery to Estimate Secchi Depth Turbidity of Taiwan Coastal Water |
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作者 | 王驥魁; 康哲銓; | 書刊名 | 航測及遙測學刊 |
卷期 | 14:4 2009.12[民98.12] |
頁次 | 頁317-332 |
分類號 | 351.938 |
關鍵詞 | 透水光達; 沙奇盤深度; 海水透視度; MODIS; Airborne bathymetric lidar; Secchi depth; Water clarity; |
語文 | 中文(Chinese) |
中文摘要 | 海水透視度為影響透水光達系統 (Bathymetry Lidar)的主因,若能在施測時依據海水透視度進行飛航規劃,則可有效提升整體施測效益。沙奇盤深度常用於量測海水透視度,因此本文利用 Aqua MODIS衛星影像輔以現地蒐集之沙奇盤、透光度計與背向散射計等 65點外業船測資料,其中將船測資料同步之 19個衛星影像,分別利用 488nm與 532nm兩個波段,搭配三種不同沙奇盤深度與海水光學性質的關係式,進行沙奇盤深度與船測值分析比較,顯示 532nm波段的推估結果優於 488nm波段,並由三種關係式中確認誤差最小的關係式。分析 2004年至 2007年的 MODIS影像資料,顯示台灣海域之沙奇盤深度與海水光學性質皆有年週期變化,可作為透水光達評估作業之參考依據。 |
英文摘要 | Secchi depth affects the performance of the airborne bathymetric lidar system. Therefore, the operation efficiency can be benefited if the secchi depth turbidity can be obtained in advance. In this research, the MODIS sensor onboard Aqua satellite is used due to its ability to provide extensive temporal and spatial imagery. A total of 65 depth profiles are collected including instruments of Secchi Disk, AC-9, and Hydroscat-6 from May, 2007 to May, 2008. Within that dataset, a total of 19 profiles were collected concurrent with Aqua MODIS overpass. There have been reports of three relationships between optical properties and secchi depth based on either 488 nm or 532 nm. Investigations are made to compare which combination of optical relationship and wavelength is most reliable. Temporal analysis of MODIS images reveal a yearly variation of Secchi depth values, which is important information for airborne bathymetric lidar flight planning. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。