 The Landsat-8 operational land imaging sensor is a new, unmanned, low-emission satellite imaging instrument. It is capable of observing in the near field, with a resolution comparable to the U.S. National Oceanic and Atmospheric Administrations, NAFA, instruments. It was radiometrically calibrated prior to launch in terms of spectral radiance and, in terms of reflectance, prior to launch. On-orbit measurements show the OLLI has generally been stable to within the uncertainties. This article was authored by Brian Markham, Julia Barsi, Gear Cverin, and others.