Detection of harmful algal blooms of Karenia mikimotoi using MODIS measurements: A case study of Seto-Inland Sea, Japan

► A new practical method to detect HABs was developed. ► The method was based on MODIS nLw spectral shape discrimination. ► The method could discriminate HABs from non-HABs. ► The method could discriminate HABs from non-living in-water constituents. ► The method can be integrated in the HABs early warning system.