大量绿潮漂浮聚集到岸边,阻塞航道,同时破坏海洋生态系统,严重威胁沿海渔业、旅游业发展.为了实现绿潮的漂移距离、漂移方向和覆盖面积遥感研究,首先对MODIS数据进行分析研究,再对目标海域绿潮采用拉格朗日追踪法和校正归一化植被指数法,最终计算得出绿潮未来24小时漂移方向和漂移距离,绿潮爆发时的覆盖面积.此外,通过绿潮光谱特征还可辨别是否是浒苔绿潮.比较漂移距离和漂移路径,初步得出绿潮的漂移距离和漂移路径与风和流密切相关.%Large green tides that gather to shores can block the waterway,destroy the marine ecosystem,and threat coastal fisheries and tourisms.In order to study the drift distance,drift direction and cover area of the green tide using remote sensing data,we first analyze the MODIS data,next the Lagrangian tracking method and the normalized difference vegetation index (NDVI) method are applied to the target area,then,the drift distance and drift direction of green tide in 24 hours and the cover area of tide burst are calculated.In addition,the green tide can be identified as Enteromorpha Prolifra or not through the analysis of its spectral features.After comparing the drift distance and drift trajectory,a preliminary conclusion can be derived that the above two factors of green tide have close relation to wind and currents.
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