Remotely sensing <i>K. foliaceum</i> blooms in the southern Red Sea and comparison with <i>in situ</i> measurements.

(a) and (b) False color composite image generated using the NIR, green and blue reflectances (i.e., R = Rrs (748), G = Rrs (547), B = Rrs (443)). (c) Satellite-derived Chl-a using ABI algorithm. (d) and (e) MODIS-Aqua-derived maps of the K. foliaceum blooms in the Red Sea on 8th May 2013 [In (e) the red and white dots denote the presence and absence of HABs, respectively, as detected using satellite data. Also, the yellow circle and yellow triangles indicate the in situ sample points and highlight the presence and absence of K. foliaceum blooms, respectively]. (f) Variations in K. foliaceum cell counts recorded from the four different sampling stations in the coastal waters of Al Salif, southern Red Sea on 8th May 2013 [red squares and red circles denote satellite detection of HAB presence and absence, respectively].