Mapping Chlorophyll-a Concentrations in West Lake, China using Landsat 7 ETM+

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• 作者：Nathan Torbick¹ ;   ; ² ;   ; ^{Torbick@agsemail.com} ; Feng Hu³ ; Jianying Zhang³ ; Jiaguo Qi² ; Hangjun Zhang³ ; Brian Becker⁴
• 刊名：Journal of Great Lakes Research
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：34
• 期：3
• 页码：559-565
• 全文大小：133 K

文摘

Eutrophication is a persistent problem that affects the ecological health of many shallow lakes in China. An indicator used to monitor trophic status is chlorophyll-a; however, collection and analysis can be spatially limiting and time consuming. In this study we utilized Landsat 7 ETM+ (Path/Row 119/39) imagery for West Lake, Hangzhou, to map chlorophyll-a concentrations. An optimal linear regression model with the band ratio ETM+3/ETM+1 (independent) and concurrent field-collected water quality measurements (dependant) was developed. The resulting model, lnChl.= 5.009 (ETM+3/ETM+1)-1.855, showed a strong (R² = 0.815) ability to accurately map the distribution of chlorophyll-a. The straightforward approach carried out to assess this fresh-water lake in a rapidly developing region increased the level of information required to combat aquatic ecosystem degradation.