應用ISIS高頻譜光學遙測影像於曾文水庫之水質監測

Application of ISIS Hyperspectral Optical Remote Sensing Imagery on Monitoring the Water Quality of Tseng-Wen Reservoir

劉正千(Cheng-Chien Liu) ； 張智華(Chih-Hua Chang) ； 許華宇(Hua-Yu Hsu) ； 譚子健(Chi-Chen Tan) ； 溫清光(Ching-Gung Wen)

《科儀新知》 161期 (2007/12) Pp. 29-42

https://doi.org/10.29662/IT.200712.0004

摘要

水庫水質之監測為攸關人類基本生活需求之重要課題。本研究配合國家實驗研究院儀器科技研究中心以機載式智慧頻譜影像儀在曾文水庫上空取像時，同步以手持式高頻譜輻射儀在現場量測水面反射頻譜，並採取水樣。隨後於實驗室中依標準作業程序分析所有水樣之固有光學性質(IOPs)與各項水質參數，以作為校正使用之地真資料。再對ISIS影像進行幾何改正與水面反射率校正處理。最後以GA-SA反算法分別對水面量測之反射頻譜與影像所提取之反射頻譜進行分析，並與實驗室分析所得之IOPs與各項水質參數加以比較，藉以評估並討論未來應用機載ISIS高頻譜影像於水庫水質監測之可行性。

並列摘要

Monitoring the water quality of a reservoir is one crucial task closely related to the basic requirement of human being. The ISIS hyperspectral image of Tseng-Wen Reservoir was taken by ITRC (Instrument Technology Research Center) from an airborne platform. In the meantime, the handheld radiometer was employed to measure the spectral reflectance on the water surface. The water samples were taken and brought into the laboratory to analyze the inherent optical properties and various parameters of water quality, following the standard procedure of operation. These results were used as the ground truth for validating the retrievals from ISIS imagery later on. The ISIS image was geo-referenced and converted to the map of surface reflectance. The latest progress in hyperspectral data inversion, namely GA-SA approach, was employed to process the ISIS-derived surface reflectance at seven sites. The retrievals of IOPs and water quality parameters were then compared to the earlier results obtained form the laboratory analysis. This research enables us to evaluate and discuss the feasibility of monitoring the water quality of a reservoir using the ISIS hyperspectral optical imagery.