2023 Installations

The 2023 campaign saw four differnt configorations of instruments on board the VP-FBL Twin Otter in Italy, UK and Canada.

Instrument Orientations

Note: I believe that the IMU being "backwards" is the way our processing systems expect it.

Installation	Julian Range	IMU	Owl	Fenix1k	Ibis	PhaseOne
Italy 1	143 - 152	Backwards	Backwards	Backwards	Forwards	Forwards
Italy 2	176 - 183	Backwards	Backwards	Backwards	Forwards	Forwards
UK	190 - 200	Forwards	Not Installed	Backwards	Forwards	Forwards
Canada	226-235	Forwards	Forwards	Backwards	Forwards	Forwards

The following should outline the data from which instruments which requires across-sample flipping in order to map.

Installation	Julian Range	Owl	Fenix1k	Ibis
Italy 1	143 - 152			flip
Italy 2	176 - 183			flip
UK	190 - 200		flip
Canada	226-235		flip

Boresight Values

Values are in the format of pitch, roll and yaw.

Installation	Julian Range	Fenix1k	Ibis	Owl
Italy 1	143 - 152	0.63 -1.10 1.90	0.18 -1.60 1.00	See below
Italy 2	176 - 183			See below
UK	190 - 200	0.45 -0.10 1.50	-0.20 -0.70 0.75	Not installed
Canada	226 - 235

The Owl boresighting for the Italy flights is more complicated as it was on a movable mount allowing data to be collected a different angles. Each angle changes the boresight offsets.

Italy 1 Owl Boresight:

Angle	Pitch	Roll	Heading
Nadir
20
35

Italy 2 Owl Boresight (julian day 179):

Angle	Pitch	Roll	Heading
Nadir	0	-0.60	0.70
20	-0.15	-0.60	0.99
34	-0.25	-0.60	1.20

Note: Offsets for the 20 degrees looking angle have been estimated by scaling the difference between the nadir and 34 degree offsets.

Swatch Masking

The Fenix1k and Ibis field of view is obstructed by the aircraft throughout this flying season. This appears as a vignette and needs to masked during aplcal. The following mask files have been made to achieve this.

Installation	Julian Range	Fenix1k	Ibis
Italy 1	143 - 152	f1k_swathedge_mask.txt
Italy 2	176 - 183	f1k_swathedge_mask.txt
UK	190 - 200		f1k_swathedge_mask.txt
Canada	226-235