GB18_00, flight day 129/2018, Boresight

[mark1]

Data location: /users/rsg/arsf/arsf_data/2018/flight_data/nerc-arf_internal/GB18_00-2018_129_Boresite_Calibration_Wooster

Data arrived from NERC-ARF via external hard disk on 15/05/18.

Delivery of owl data was requested for GB18/196.

Scientific objective: Boresight

Priority: Urgent

PI: NERC-ARF (Boresight) / Martin Wooster (Procesed Owl)

Sensors:

• Fenix (requested)
• OWL (requested)

[mark1]

Fenix and Owl are missing Specim timestamps. Have informed Gary and James.

Also, Owl line 1 is missing the nav file completely (but logsheet says lines 4 onwards are the ones to use)

[mark1]

Basestation PPP processing:

Latitude: 52 04 27.10312
Longitude: -0 37 24.83725
Ell Height: 149.835m

NOTE: above are for the ARF basestation which in the end we did not use (we used St Neots) with:
Latitude: 52 11 07.31238
Longitude: -0 06 44.99323
Ell Height: 120.016

[mark1]

Ended up using the St Neots basestation rather than the ARF one as it was closer to the survey site.

[wja]

Fenix Processing

Fenix line 10 has same starting time and ending time. Need to correct for or not process it.

[wja]

Fenix processing

Also the same problem for fenix lines 06 and 11. Moving them to a dir called hyperspectral/problematic_lines for now (to show Will how to process - asm writing here).

[wja]

Fenix

For processing the boresight until the new cal is done, we have replaced the wavelenghts with the 2016 cal. Will use also this one for the calibration (asm)

[asm]

Replying to wja:

Fenix

For processing the boresight until the new cal is done, we have replaced the wavelenghts with the 2016 cal. Will use also this one for the calibration (asm)

Correction, used the 2015 calibration (we did not fly on 2016).

[asm]

Also run the unpacked checks:

-Fenix line 13: 2 incident with a total of 25 dropped frames
-Fenix line 14: 2 incident with a total of 59 dropped frames
-Fenix line 18: 2 incident with a total of 32 dropped frames
-fps differs from fps_qpf by 0.631 in file: fenix 14
-Owl lines 2 and 6 have 1 dropped frame incident
-No use owl nav as well
-No GPS starting point and ending point for Owl line 1

[asm]

Fenix Processing

Added a calculated ending time for 6, 10 and 11 and put them with the others for processing (original headers are safe in the usual place). Recreated the APL config file, all looking good.

[asm]

Owl Processing

Added GPS Start Time to owl hdr 1 (it was there but it was not GPS time but only UTC start time). Recreated the APL config that now contais the owl sensor as well.

[wja]

Fenix Processing

Currently finding flightline SCT values.

[dac]

Owl Processing

Took over owl processing - started calibration.

[wja]

Fenix Processing

SCT values found:

Flightline	SCT Value
1	41.33
2	2.53
3	3.09
4	3.64
5	48.31
6	4.23
7	3.39
8	3.30
9	3.66
10	5.74
11	38.5
12	2.20
13	31.19
14	3.39

[dac]

Owl Processing

First three lines of Owl don't contain usable data. Recording on logsheet starts at file #4.

[wja]

Fenix Processing

SCT value for flightline 10 (5.74) displays some error (wobble) but is clearly more accurate than values ±0.01.

[dac]

Owl Processing

SCT values for all lines are between 4 - 6 seconds (see ~dac/scratch_network/nerc-arf-processing/2018-129_owl_scts.ods).

Have run through all lines using SCTs of 4 - 6 seconds at 0.1 s intervals. Handing back to Aser to continue processing.

[asm]

Owl Processing

Have found SCT values:

Flightline	OWL
4	4.72
5	4.53
6	4.69
7	5.09
8	5.00
9	4.35
10	4.98
11	4.85
12	4.03
13	4.82
14	5.01
15	3.84
16	5.67
17	4.17

[asm]

Owl Boresight

Owl boresight values:
Pitch: 0.28
Roll: 0.17
Heading: 0.20

Please have a check and confirm. The SCT for lines 14 and 15 were a bit difficult to find so might be a bit unreliable. Flightline 13 was however very clear.

[wja]

Fenix Processing

The FPS and associated SCT values have been identified for the following flightlines:

Flightline	SCT Value	FPS Value
2	2.44	54.95
3	2.99	54.95
4	3.51	30.95
6	4.10	30.96
7	3.31	30.95

Note that the FPS values are -0.05 from the original in the header (apart from flightline 6). Might be a good starting point to note if this issue arises again.

[wja]

Fenix processing

Fenix boresight values:

Pitch: 0.45
Roll: -0.75
Heading: 0.50

I found these buy processing the flightlines with SCT and FPS values documented on this ticket previously. Flightline 2 seems to have a constant offset that does not seem to be boresight related.

These may be improved whilst I have a look at more flightlines.

[wja]

Fenix Processing

Additional flightline SCT / FPS values:

Flightline	SCT Value	FPS Value
12	2.2	21	same FPS as original header.
13	31.19	21	same FPS as original header.

Revised Fenix Boresight values:
Pitch: 0.40
Roll: -0.76
Heading: 0.55

[wja]

Fenix Processing

Fenix pitch boresight value falsely reported as -0.40 (now corrected) when it is in fact +0.40.

To clarify, Fenix Boresight values:
Pitch: 0.40
Roll: -0.76
Heading: 0.55

[dac]

Owl Processing

Processed Owl data was requested for this flight. Mapping all bands.

[dac]

Owl Processing

Delivery has been created ready to be checked but still needs a logsheet, which will need manual edits.

[wja]

Owl Delivery Check

• PI Details: NERC internal flight.
• Two DEMs - ASTER & EA LIDAR, APL config used ASTER only.
• Level1b flightlines 1-3 are present in delivery but not processed further (no level3 or screenshot). These are small in size - overwritten by aux.xml files?
• Bands 81+ on flightline 13 do not look right.
• Overflows don't seem to be more prevelant in bands specified in Read_Me (there's a roof that overflows in many bands).
• Issues with plotting owl spectra vs Py6s due to flightline 1 excisiting as level1b but not level3 - will redo when this is changed/clarified. *
• Logsheet currently being produced.

Edit: I now know that Py6S does not run on OWL wavelengths - disregard that point.

[dac]

Owl Processing

Produced logsheet and fixed the following issues:

• PI for delivery is Martin Wooster
• Removed EA DEM, was used for boresight processing but redid for delivery to use standard ASTER
• Removed lines 1 - 3

Ready for another check.

[wja]

Owl Delivery Check

All looks good.
Ready to deliver.