I've been searching for the band-specific radiance gains/offsets for GeoEye-1 imagery. The metadata file that came with my imagery has information such as sun azimuth, but I don't see anything that appears to be radiance gains. I have read this document (http://www.apollomapping....nce_at_Aperture.pdf) in hopes to convert what I believe to be digital numbers to exoatmospheric reflectance. My imagery is "Geo" level processed, so I understand that it has been radiometrically corrected, however does that mean that it is already in exoatmospheric radiance and I can proceed with converting that to exoatmospheric reflectance? I have contacted DigitalGlobe, but received no response. Because I am not technically a customer (I acquired the imagery through an unclassified high res imagery database) I cannot get technical support from them. I would also like to know if anyone has better technical information about the GeoEye-1 sensor -- I have scoured the literature and the internet and come up with very few white papers or anything detailed, other than the paper cited above. Thanks!