基于GOCI数据的2015年黄海海域绿潮监测及时空变化分析

基于2015年的GOCI影像数据,以黄海海域为研究区域,结合NDVI,EVI,KOSC和IGAG方法,进行绿潮信息的提取,并对绿潮的分布状况、覆盖面积、密集度和漂移路径进行分析.结果表明,采用NDVI,EVI,KOSC和IGAG方法提取2015年黄海海域绿潮的结果一致,绿潮发生于5月中旬,消亡于8月上旬,持续时间约为75 d,其中6月中下旬是绿潮的爆发期,绿潮覆盖面积和分布面积均达到最大值.从绿潮漂移轨迹来看,绿潮发生于苏北外海海域,随后逐渐向青岛近海域漂移.

Monitoring of green algae and analysis of spatial-temporal changes based on GOCI image data in Yellow Sea in 2015

Yellow Sea is selected as the study area in monitoring green algae.Based on GOCI image data from 2015,this paper obtains the information of green algae by using NDVI,EVI,KOSC and IGAG method,and further analyzes the distribution,coverage area,density and drift path of green algae.The result shows that the extraction result of green algae by using NDVI,EVI,KOSC and IGAG method in Yellow Sea in 2015 stay consistent,in which green algae first occurred in middle May and demised in early August,the duration of disaster lasting for about 75 days.In mid to late June as the outbreak period of green algae,the distribution area and overage area reached the maximum value at the same time.From the drift path of green algae,green algae occurred in the open sea of northern Jiangsu,and then it drifted to Qingdao offshore gradually.