A study on the Influence of Surface Waves in the Investigation of Turbidity using Visible and Near Infrared Remotely Sensed Satellite Data
A study on the Influence of Surface Waves in the Investigation of Turbidity using Visible and Near Infrared Remotely Sensed Satellite Data
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表面波对可见光和近红外遥感卫星数据浊度调查的影响研究
DOI：
10.11440/rssj1981.12.305
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发表时间：
1992
影响因子：
--
通讯作者：
S. Ogata
中科院分区：
文献类型：
--
作者：
Y. Inomata;T. Fujiwara;S. Ogata
由于卫星数据的可见光和近红外波段对浊度和叶绿素敏感，卫星遥感在海域环境保护监测中占主导地位。然而，在以往的研究中，没有考虑到表面波对亮度值的影响。当表面波使可见光和近红外波段的亮度值大大增强时，应将其影响从视值中检测出来并消除，以免造成混淆。作者检验了MOS-1 MESSR数据，其中包含可能受表面波影响的区域，这些区域被扩展到足以分类的范围，提出了基于亮度统计的面波因子定义，并在此基础上采用直方图叠加法（HOM）进行了无监督分类，并与常规聚类分析的结果进行了比较。只有当应用HOM时，才能将表面波影响的区域与混浊区域区分开来。此外，它的效果在近红外波段更为明显。从实验和理论上研究了表面波对太阳光反射强度的影响。结果表明，夏季太阳光入射角最大，风向为东南偏南时，卫星观测到的反射强度最强，与太阳光的方向相同。
The satellite remote sensing is prevailing in sea areas monitoring for environmental conservation since the visible and near infrared bands of satellite data are sensitive to turbidity and chlorophyll. In previous studies on this subject, however, the effect of the surface waves on the brightness values has never been considered so far. If the brightness values of the visible and near infrared bands are greatly enhanced by the surface waves, its effect should be detected and eliminated from the apparent values not to make confusion.The authors have examined the MOS-1 MESSR data containing the areas with probable effect of the surface waves, which are extended widely enough to classify, and proposed a definition of the surface waves factor using the statistics on the brightness values.We carried out the unsupervised classification by Histogram Overlay Method (HOM) on the basis of this definition and compared with the results by conventional cluster analysis. The areas with effect of the surface waves were discriminated from the turbid areas only when the HOM was applied. In addition, its effect was more pronounced in the near infrared band.The effect of the surface waves on the reflection intensity of the sun light was investigated experimentally and theoretically. It was shown that the strongest reflection intensity is observed by satellites in summer when the incident angle of the sun light becomes the highest and when the direction of the wind is south-southeast, i.e., the same direction with the sun light.