If you plot Eagle and Hawk processed output on the same graph (see attachment) there's about a 30nm overlap for the spectral range, and the instruments don't seem to agree in this overlap. Even if the instruments don't give the same magnitude, the absorption features shown should align (and they don't). This suggests that the spectral calibration of one or both instruments may be out by up to 100nm, which appears to be the displacement needed to make the two graphs align.

This ticket is spawned from #74 (support ticket for Rachel Gaulton, who found this problem). See that ticket for the initial work, summarised here.

Eagle's calibrated spectral profile on flights appears to differ substantially from CASI in terms of the measured radiance. The shape is the same but the numbers are different by a factor of approximately 4-8, depending on the pixel chosen.

Short history to date:

• 16/Oct Initial problem report from Rachel (2006 dataset)
• 18/Oct AKW recommended investigating on a known dataset
• 22/Oct Picked 166/2007 boresight flight and confirmed we're also seeing this issue
• 29/Oct Demonstrated to Gary and agreed routes for investigation

Data location: /users/rsg/arsf/arsf_data/2012/flight_data/greece/EM10_02-2012_138_Milos

Data arrived from Greece via SATA disk on 13/07/2012

EM10/02 Scientific objective: Study of a volcano on the island of Milos, Greece.

EM10/02 Priority: a4m

PI: Graham Ferrier

Sensors:

Camera (17/08/2012) Eagle (30/08/2012) Hawk (30/08/2012) LiDAR (17/08/2012)