Hyperspectral instrument boresight information

Boresight calculation

Every time the hyperspectral instruments are fitted to the aircraft they need to be boresighted. This is the process in which the off-nadir pointing direction is calculated, in terms of the 3 angles roll, pich and heading. This is currently done as an iterative procedure processing a selection of flight lines taken over the calibration site using different boresight parameters. The flight lines will be from a selection of North-South, East-West and diagonal flight paths. When the flight lines match up well enough, using the same set of boresight values, the boresight values are noted and used in all processing up until the instruments are removed again.

2022 Owl Boresights

For flights in 2022, the Owl was configured to move to 3 different angles from nadir, all of which had slightly different boresights shown below:

Angle	Pitch	Roll	Yaw
0	0	0	0.2
24	-0.2	0	0
36	-0.4	0	0

Eagle Boresights

Note these are summaries. For information on missing days please refer here.

Year	Time period	Pitch (degrees)	Roll (degrees)	Heading (degrees)
2013	Day 308 only	0.14	-0.41	0.22
2013	Day 192 onwards	0.12	-0.35	0.5
2013	To day 192	0.15	-0.29	0.55
2012	206 onwards	-0.3	0.3	0.13
2012	To day 206	-0.28	0.22	0.0
2011	Full year	-0.28	0.16	0.38
2010	Full year	-0.18	0.27	0.28
2009	268 onwards	-0.32	-0.52	0.26
2009	252 -> 268	-0.31	-0.66	0.35
2009	131 -> 251	-0.245	-0.77	0.269
2009	To day 130	Variable
2008	116 onwards	-0.2	-0.45	0.5
2008	043 onwards	-0.20	-0.53	0.6
2008	Ethiopia campaign	-0.2	-0.4	1.1
2007	166 onwards	0.23	-0.28	-1.4
2007	To day 130	-0.25	-0.5	-1.2
2006	Full year	0.1	-0.3	-1.25

Hawk Boresights

Note these are summaries. For information on missing days please refer here.

Year	Time period	Pitch (degrees)	Roll (degrees)	Heading (degrees)
2013	Day 308 only	0.1	-0.87	0.41
2013	Day 192 onwards	0.1	-0.85	0.5
2013	To day 192	0.16	-0.88	0.35
2012	206 onwards	-0.313	0.3	0.18
2012	To day 206	-0.31	0.28	0.0
2011	Full year	-0.27	0.27	0.5
2010	Full year	-0.26	0.28	0.5
2009	268 onwards	0.23	0.27	0.0
2009	252 -> 268	-0.25	0.25	0.0
2009	131 -> 251	-0.307	-0.203	-0.04
2009	To day 130	Variable
2008	116 onwards	-0.1	0.2	0.8
2008	043 onwards	-0.28	0.2	1.0
2008	Ethiopia campaign	-0.2	0.4	1.9
2007	166 onwards	0.0	0.35	-1.4
2007	To day 130	-0.3	0.1	-1.4
2006	Full year	-0.1	0.3	-1.25

ATM Boresights

Note these are summaries. For information on missing days please refer here.

Year	Time period	Pitch (degrees)	Roll (degrees)	Heading (degrees)
2008	116 onwards	0.2	-2.1	0.8
2007	166 onwards	0.0	-2.22	-0.75
2007	To day 130	0.08	-2.3	-0.75
2006	Full year	-0.1	-1.95	-0.4
2005	Unknown	-0.3	-2.00	-0.2

CASI Boresights

Note these are summaries. For information on missing days please refer here.

Year	Time period	Pitch (degrees)	Roll (degrees)	Heading (degrees)
2007	166 onwards	-0.85	-0.08	-0.4
2007	To day 130	Not mounted
2006	Full year	-0.7	0.2	-0.2