Härmä P, Vepsäläinen J, Hannonen T, Pyhälahti T, Kämäri J, Kallio K, Eloheimo K, Koponen S
Finnish Environment Institute, Helsinki.
Sci Total Environ. 2001 Mar 14;268(1-3):107-21. doi: 10.1016/s0048-9697(00)00688-4.
The aim of the study was to test the feasibility of the band combination of the TERRA MODIS and ENVISAT MERIS instruments for operational monitoring of lakes and coastal waters in Finland. Also simulated LANDSAT TM data were tested. Satellite bands were simulated using airborne measurements with AISA imaging spectrometer. Semi-empirical algorithms with simulated satellite data were tested against field observations using regression analysis. Interpretation of chlorophyll a, suspended matter, turbidity and secchi-disk depth was included in the analyses. The data for this study were gathered in campaigns carried out in May and August 1997 and August 1998 both for lakes in southern Finland and coastal waters of the Baltic Sea. The data set included 85 in situ observations for lakes and 107 for coastal waters. Our results show that the band combination to be included in the ENVISAT MERIS instrument enables the interpretation of water quality, including chlorophyll a concentration using semi-empirical algorithms both for lakes and coastal waters. MERIS band 9 centred at 705 nm is proven to be of vital importance for the detection of chlorophyll a in local surface waters.
该研究的目的是测试TERRA MODIS和ENVISAT MERIS仪器的波段组合用于芬兰湖泊和沿海水域业务监测的可行性。同时也对模拟的陆地卫星TM数据进行了测试。利用AISA成像光谱仪的航空测量来模拟卫星波段。使用回归分析，针对实地观测对带有模拟卫星数据的半经验算法进行了测试。分析中包括了对叶绿素a、悬浮物、浊度和塞氏盘深度的解读。本研究的数据是在1997年5月和8月以及1998年8月针对芬兰南部的湖泊和波罗的海沿海水域开展的活动中收集的。数据集包括85个湖泊的现场观测数据和107个沿海水域的现场观测数据。我们的结果表明，ENVISAT MERIS仪器中包含的波段组合能够利用半经验算法对湖泊和沿海水域的水质进行解读，包括叶绿素a浓度。事实证明，以705纳米为中心的MERIS波段9对于检测当地地表水的叶绿素a至关重要。
