“…The ENVI™ FLAASH (Fast Line of sight Atmospheric Analysis of Spectral Hypercubes) atmospheric correction module was applied to Landsat and HJ-1 images to derive the sea surface reflectance (R, unitless). FLAASH includes a method for aerosol estimation based on the dark pixel reflectance ratio method (Kaufman, Wald, Remer, Gao, Li, & Flynn, 1997), which has been successfully used in the atmospheric correction of multi-band or hyperspectral images over waters (e.g., Kutser, Pierson, Kallio, Reinart, & Sobek, 2004;Kutser, 2012;Tian, Lu, Chen, Yu, Xiao, Qiu, & Zhao, 2010;Moses, Gitelson, Perk, Gurlin, Rundquist, Leavitt, Barrow, & Brakhage, 2012;Zeng, Zhao, Tian, & Chen, 2013). The requirement of absolute accuracy of atmospheric correction in this study, however, is not critical because it is the relative height of the near-infrared band that is used for detecting and quantifying macroalgae.…”