• 方法与技术 •

### 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

1. 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
• 出版日期:2010-06-10 发布日期:2010-06-10

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

XIE Guo-qing1;LU Wei-kun1;LI Meng1;ZHOU Wei-min1;YU Ling-xiang1;LI Fa-rong2

1. 1Yunnan Agrometeorological and Satellite Remote Sensing Application Center, Kunming 650034, China;2Kunming Environment Monitor Center, Kunming 650034, China
• Online:2010-06-10 Published:2010-06-10

Abstract: 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 nm, 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.