| Version 21 (modified by wja, 7 months ago) (diff) |
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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 | flip |
Unsure why the Ibis needs flipping with the Canada install but it definitely does.
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 | -0.45 +0.05 +0.00 | -0.09 +0.25 -0.25 | -0.48 -0.27 -0.50 |
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.
Swath 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 |