Exploiting change information contained in the time series of chlorophyll-a concentration data will help to reduce the effect of chlorophyll-a inversion accuracy on red tide distribution information extraction. Based on multi-temporal Aqua MODIS data,chlorophyll-a threshold,chlorophyll-a anomaly threshold and visual analysis were utilized to extract red tide distribution of East China Sea( ECS) in May,2008. The result showed that maximum of multi-temporal 90% percentiles chlorophyll-a concentration or chlor...