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Proceedings Paper

Algae monitoring using Beijing-1 satellite: a case study in Qingdao neighbouring sea area, China
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Paper Abstract

Beijing-1 small satellite has three bands of green, red and near-infrared, with spatial resolution of 32 meters. Three days Beijing-1 data are used to retrieve distribution and living status of Enteromorpha clathrata (a kind of green algae and called Hutai in Chinese). First, use the non-supervised classification to separate the kinds who has big spectral differences. Second, the cloud and cloud-covered green algae can be separated by the ratio of near-infrared and red. In the end, the green algae distribution is obtained. The NDVI is used for indicator of living status and density. MODIS has the advantage of high temporal although its spatial resolution is much coarse than Beijing-1. A decision tree is developed to retrieve green algae. First, the cloud is eliminated by its high reflectance. Second, the NDVI is calculated and a threshold value is set to determine whether the grid is green algae. The green algae distribution results from Beijing-1 and MODIS are compared. Generally, the Beijing-1 extracted green algae is coincide with the MODIS extracted green algae. The Beijing-1 extracted algae area is smaller than that of MODIS, because the MODIS has spatial resolution of 250-meter, its situation of mix pixel is severer.

Paper Details

Date Published: 19 December 2008
PDF: 8 pages
Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 71501S (19 December 2008); doi: 10.1117/12.812115
Show Author Affiliations
Zhenghua Chen, State Oceanic Administration (China)
Zhejiang Univ. (China)
Zhihua Mao, State Oceanic Administration (China)
Juhong Zou, State Oceanic Administration (China)
Qingyuan Ma, Renmin Univ. of China (China)
Yan Bai, State Oceanic Administration (China)
Xianqiang He, State Oceanic Administration (China)

Published in SPIE Proceedings Vol. 7150:
Remote Sensing of Inland, Coastal, and Oceanic Waters
Robert J. Frouin; Serge Andrefouet; Hiroshi Kawamura; Mervyn J. Lynch; Delu Pan; Trevor Platt, Editor(s)

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