I am working on a WV2 and a WV3 image, with ENVI 5.2. The WV2 one can be convert into either radiance or reflectance by using the Radiometric Calibration Tool. However, for the WV3 image, it can only be converted into Radiance, but NOT reflectance. After looking at the metadata, I have found that the irradiance data is missing for the WV3 image, so I believe that is why ENVI cannot convert it into reflectance? Is there any solutions for the situation or what steps should I take to get it to reflectance? Thanks http://imgur.com/CCTnUyI (image of missing irradiance data for WV3) http://imgur.com/DfQ6KwT (image of when I clicking the radiometric calibration tool for the WV3 image)