Radiometric calibration of a non-imaging airborne spectrometer to measure the Greenland ice sheet surface - Crawford, Christopher J.; van den Bosch, Jeannette; Brunt, Kelly; Hom, Milton; Cooper, John; Harding, David; Butler, James J.; Dabney, Philip; Neumann, Thomas; Cleckner, Craig; Markus, Thorsten (Atmospheric Measurement Techniques, 2019)