Tracking on-orbit changes in response versus scan angle for MODIS reflective solar bands using Dome C

MODIS instruments have been operating over 21 and 19 years on the Terra and Aqua spacecraft, respectively. As both instruments continue to operate beyond their design lifetime of 6 years, relying on the on-board calibrators alone is proving a challenge to accurately characterize their response at all scan angles, especially for the reflective solar bands. This study presents an alternative approach that relies on Earth view responses at multiple scan angles from a single site over Dome Concordia (Dome C), Antarctica, one of the most homogeneous land surfaces uniformly covered by snow. This approach has advantages of more frequent overpasses over the entire scan angle range than the desert sites.