This section is dedicated to conversion to TOA radiance and reflectance for Landsat 8 OLI as the conversion equations are slightly different than earlier Landsats. Standard Landsat 8 L1T products are distributed by USGS EROS in 16 bits unsigned integer format and can be rescaled to TOA spectral reflectance and TOA spectral radiance using the radiometric rescaling coefficients provided in the product metadata (MTL) file [13]. Results from both radiance and reflectance-based cross calibration will be presented in this paper.