基于光谱特征和HSV变换融合MODIS影像的滇池叶绿素a浓度监测  

Monitoring of chlorophyll-a concentration in Dianchi Lake based on spectral characteristics and merged MODIS images by HSV transformation

作　　者：谢国清[1] 鲁韦坤[1] 李蒙[1] 周伟民[1] 余凌翔[1] 李发荣[2] 

机构地区：[1]云南省农业气象与卫星遥感应用中心,昆明650034 [2]昆明市环境监测中心,昆明650034

出　　处：《生态学杂志》2010年第6期1245-1249,共5页Chinese Journal of Ecology

基　　金：中国气象局蓝藻水体监测预警系统(一期)项目(200002002001);昆明市环境保护局资助项目

摘　　要：使用实测高光谱数据,研究滇池水体的光谱特征,应用统计方法建立滇池叶绿素a浓度的高光谱反演模型,并基于滇池水体的光谱特征,运用HSV变换融合遥感影像技术,监测水体叶绿素a浓度分布。结果表明:滇池水体光谱的反射峰位于550和700nm附近;此2个反射峰的位置和大小对水体叶绿素a浓度的变化反应最敏感。随着水体叶绿素a浓度升高,2个反射峰的峰值越接近,同时,550nm附近反射峰向短波方向偏移,而700nm附近反射峰向长波方向偏移。用这2个反射峰峰值的差值作为参数建立的滇池水体叶绿素a浓度估测模型,其精度较高;HSV变换融合MODIS遥感影像的假彩色合成图能直观反演滇池水体叶绿素a浓度的空间分布。By using measured hyperspectral data, the spectral characteristics of the water body in Dianchi Lake were analyzed, and a hyperspectral inversion model for the chlorophyll-a concentration in the Lake was established by statistical methods. Based on the spectral characteristics and the merged MODIS images by HSV transformation, the distribution of chlorophyll-a concentration in the Lake was monitored. It was shown that the spectral reflectance peaks of the water body were near 550 and 700 rim, and the positions and values of the peaks were very sensitive to the changes of chlorophyll-a concentration. The higher the chlorophyll-a concentration, the closer the values of the two peaks, and the reflective peak near 550 nm had an excursion to short wave while that near 700 nm had an excursion to long wave. Therefore, the difference between the values of spectral peaks near 550 and 700 nm could be used as the parameter in establishing a model for inversing chlorophyll-a concentration, and the estimation could have a higher precision. Our results indicated that the MODIS false color images achieved by HSV transformation and merging technologies could visually inverse the spatial distribution of chlorophyll-a concentration in Dianchi Lake.

关 键 词：光谱特征 反演模型 影像融合 

分 类 号：X832[环境科学与工程—环境工程]