The Operational Land Imager (OLI) onboard the Landsat 8 satellite has a panchromatic band (503–676 nm) that been used to compute virtual spectral known as “orange contra-band” (590–635 nm). major application of orange contra-band is monitoring cyanobacteria which usually quantified by measurement concentration phycocyanin (PC) an absorption peak around 620 nm. In this study, we evaluated use ap...