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The algae monitoring using Beijing-1 Satellite: a case study in Qingdao neighbouring sea area, China

机译:使用北京一号卫星进行藻类监测:以中国青岛周边海域为例

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摘要

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.rnThe 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.
机译:北京一号小卫星具有绿色,红色和近红外三个波段,空间分辨率为32米。使用北京1天的三天数据来检索克氏梭菌(一种绿色藻类,中文称为呼台河)的分布和生活状况。首先,使用非监督分类来区分具有较大光谱差异的种类。其次,可以通过近红外和红色的比率来分离云和被云覆盖的绿藻。最后,获得了绿藻分布。 NDVI用于指示生活状况和密度。尽管MODIS的空间分辨率比Beijing-1大得多,但MODIS具有时间优势。开发决策树以检索绿藻。首先,由于高反射率消除了云。其次,计算NDVI并设置阈值以确定网格是否为绿藻。-比较Beijing-1和MODIS的绿藻分布结果。通常,Beijing-1提取的绿藻与MODIS提取的绿藻一致。 Beijing-1提取藻类面积小于MODIS,因为MODIS具有250米的空间分辨率,其混合像素的情况更加严峻。

著录项

  • 来源
  • 会议地点 Noumea(NC)
  • 作者单位

    State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, Zhejiang, China, 310012 Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, China, 310027;

    State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, Zhejiang, China, 310012;

    State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, Zhejiang, China, 310012;

    Department of Urban Planning Management, School of Public Administration, Renmin University of China, Beijing, China, 100872;

    State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceani;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Beijing-1; MODIS; green algae;

    机译:北京1; MODIS;绿藻;

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