Figure 8 | Scientific Reports

Figure 8

From: New capabilities of Sentinel-2A/B satellites combined with in situ data for monitoring small harmful algal blooms in complex coastal waters

Figure 8

(a) Landsat-8 RGB (bands 4-3-2) composite in the study region on 16 July 2019 showing the L. polyedra algal bloom located in the waters off the Guadiana estuary mouth (contains modified Copernicus Sentinel data 2019 processed by Sentinel Hub); (b) chl-a concentration (mg/m3) after atmospheric correction with ACOLITE for the same scene. Some residual sun glint after atmospheric correction is visible in the lower right panel of the chl-a map (black pixels). Blue rectangles indicate high concentrations of chl-a due to the algal bloom, whereas the red rectangle indicates a high chl-a concentration due to high turbidity in the Tinto-Odiel estuary (Ria de Huelva and Punta Umbria, Fig. 1b). Maps are generated by SNAP 7.0.0 (https://step.esa.int/main/download/snap-download/). L8 image was downloaded from Earth Explorer (https://earthexplorer.usgs.gov/) and processed with ACOLITE 20190326.0 (https://odnature.naturalsciences.be/remsem/software-and-data/acolite).

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