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

Zhenghua Chen; Zhihua Mao; Juhong Zou; Qingyuan Ma; Yan Bai; Xianqiang He

doi:10.1117/12.812115

19 December 2008 Algae monitoring using Beijing-1 satellite: a case study in Qingdao neighbouring sea area, China

Zhenghua Chen, Zhihua Mao, Juhong Zou, Qingyuan Ma, Yan Bai, Xianqiang He

Proceedings Volume 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters; 71501S (2008) https://doi.org/10.1117/12.812115
Event: SPIE Asia-Pacific Remote Sensing, 2008, Noumea, New Caledonia

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.

Citation Download Citation

Zhenghua Chen, Zhihua Mao, Juhong Zou, Qingyuan Ma, Yan Bai, and Xianqiang He "Algae monitoring using Beijing-1 satellite: a case study in Qingdao neighbouring sea area, China", Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 71501S (19 December 2008); https://doi.org/10.1117/12.812115

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KEYWORDS

MODIS

Clouds

Satellites

Reflectivity

Spatial resolution

Remote sensing

Vegetation

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