User Manual - pancroma

and band 5 (MIR) also be input. This algorithm is based on the method of Luoand requires the band DNs be converted to top of atmosphere (TOA) reflectanceat the sensor in order to make the computation. The relationship is given by:WhereTOA Reflectance = (π * L λ * d 2 ) / (ESUN λ * cos θ)L λ = TOA radianced = earth-sun distance in astronomical unitsESUN λ = mean solar exoatmospheric irradiancesθ = solar zenith angleIn order to use this method, select ‘File’ | ‘Open’ and input, in this order:band file to be masked;band 1 fileband 3 fileband 4 fileband 5 fileSelect ‘Gap Fill’ | ‘Mask Clouds’ | ‘Five File Method’ from the menu. After thefiles are opened, you will be prompted to enter the acquisition date of theLandsat image in ordinal days (number of days elapsed into the acquisition year)and the solar elevation angle. This information can be found in the Landsatmetadata file, as shown below:132