Coral Bleaching Detection Using Sentinel-2B/MSI Images

In recent years, affected by global warming and human factors, global coral bleaching events have occurred frequently. According to the reports, severe coral bleaching events occurred in the northwestern of Hainan Island, South China Sea in 2020. In this paper, based on the normalized difference images of 10-meter spatial resolution Sentinel-2B/MSI (Multi Spectral Imager) visible bands, the coral bleaching area was detected. In the images of July and September, a large area of coral reef was found to be bleached. Compared with July, the area of bleaching in September increased, which was consistent with field survey.