热带海洋学报 ›› 2010, Vol. 29 ›› Issue (2): 74-79.doi: 10.11978/j.issn.1009-5470.2010.02.074cstr: 32234.14.j.issn.1009-5470.2010.02.074

• 海洋光学 • 上一篇    

光学浅水海草高光谱识别

杨超宇1,2, 杨顶田1, 赵俊1,2   

  1. 1. 中国科学院南海海洋研究所热带海洋环境动力学重点实验室, 广东 广州 510301; 2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2009-05-06 修回日期:2009-09-22 出版日期:2010-03-23 发布日期:2010-03-23
  • 作者简介:杨超宇(1985—), 女, 新疆石河子市人, 硕士研究生, 主要从事海洋水色研究。
  • 基金资助:

    国家自然科学基金(40876092); 国家高技术研究发展计划项目(2006AA09Z155); 广东省科技计划项目(2008B030303026); 广东
    省自然科学基金团队项目(8351030101000002); 中国科学院南海海洋研究所知识创新工程领域前沿项目(LYQY200701)

Hyperspectral recognition of seagrass in optically shallow water

YANG Chao-yu1,2, YANG Ding-tian1, ZHAO Jun1,2   

  1. 1. LED, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; 2. Graduate Univ. of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2009-05-06 Revised:2009-09-22 Online:2010-03-23 Published:2010-03-23

摘要:

以三亚湾泰莱藻为例, 对海草光谱特征进行分析。结果表明, 450—780nm是海草光谱主要敏感波段, 其波段内的导数光谱是海草叶面积大小序列辨别的有效依据。一阶导数获得的红边与叶片叶绿素a浓度密切相关。   海草在625nm、675nm 两处出现明显的导数特征峰, 两峰峰值相差较大; 其优势特征峰分布在550nm、700nm、750—780nm。实际应用中, 此特征可作为海草底质分类的识别条件, 与海草覆盖率和光谱特征的关系相结合, 可对大量的遥感数据进行识别, 从而达到大尺度遥感监测海草分布和动态变化的目的。

关键词: 海草, 高光谱, 光学浅水, 导数光谱, 覆盖率

Abstract:

The authors use the spectrum of Thalassia to analyze the optical properties of seagrass substrates. The results show that in the range of 450?780nm, the derivative spectral reflectance of seaweed can reflect the variability of leaf area index with high accuracy. Red edge calculated by the first order derivative spectrometry is a good indicator for chlorophyll concentration. In the derivative spectra, there are two obvious peaks at 625nm and 675nm, and the difference between the two peak values is large for seagrass. Other dominated peaks appear at 550nm, 700nm, and 750?780nm. Combining with the relationship between seagrass coverage rate and the spectral properties, the properties of peak distribution can be utilized to classify plenty of re-mote sensing data sets in order to monitor large scale spatio-temporal dynamic patterns.

Key words: seagrass, hyperspectrum, optically shallow water, the first derivative spectrum, coverage rate