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生态学杂志 ›› 2010, Vol. 29 ›› Issue (06): 1245-1249.

• 方法与技术 • 上一篇    下一篇

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

谢国清1**;鲁韦坤1;李 蒙1;周伟民1;余凌翔1;李发荣2
  

  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

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700 nm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,550 nm附近反射峰向短波方向偏移,而700 nm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。  

关键词: 荒漠植物, 生物量, 估算, 冠丛特征

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.

Key words: Desert plant, Biomass, Estimation, Crown characteristic