Satelliteimages show coastal algaeblooms have grown larger over past two decades nature
). Comparisons from various images worldwide showed that our algorithm could successfully identify regions with high FLHvalues and brownish-to-darkish features on the ERGB images, which can be considered phytoplankton blooms.
Second, we delineated additional 15,466 bloom-containing pixels from 35 images covering different coastal areas, using the same visual inspection and manual delineation method as for the training sample pixels. Moreover, we also selected 14,149 bloom-free pixels within the same images as bloom-containing images. We applied our algorithm to all these pixels, and compared the algorithm-identified and manually delineated results.
Third, we validated the satellite-detected phytoplankton blooms using in situ reported HAB events from the HAEDAT dataset. For each HAB event in the HAEDAT dataset, we obtained all MODIS images over the reported bloom period . Within each year, we estimated the ratio between the number of satellite images with ‘bloom detected’ against the number of valid images during the bloom periods across the entire globe .
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