Data location: /users/rsg/arsf/arsf_data/2014/flight_data/malaysia/MA14_16-2014_241_Sarajavo

Data arrived from ARSF via network transfer on 19/12/2014

MA14/16 Scientific objective: Unknown

MA14/16 Priority: a4m

PI: Andy Ford

Notes: No RCD data Large difference between fps_set and fps_qpf

Sensors:

Fenix (Requested) LiDAR (Requested) RCD (Requested) FW LiDAR (Requested)

Two issues:

• Amer checking on LIDAR.
• Use of bsq with azgcorr
  • mggr suspects perhaps the missing scans are throwing off the navigation?

Rachel's initial contact email:

I am trying to process ATM and CASI data flown last summer over my two
sites in Wales (GB06/05, PI - Tim Malthus). Unfortunately we are
having a few problems with AZGCORR and I wanted to check whether you
had encountered them before and had any idea what might be wrong (or
who else might have).

As we are carrying out atmospheric correction before geometrically
correcting the swaths in AZGCORR, so we are using the resulting .bsq
image in conjunction with the original .hdf (and a DTM) as inputs to
AZGCORR, as recommended in the user guide. With the CASI data and most
of the ATM swaths this appears to work ok (at least as far as can be
determined by visual inspection of the results), however with certain
swaths the geometric correction is not successful. These seem to be
swaths with considerable numbers of missing pixels / scan lines.  When
the raw .hdf data is geometrically corrected directly, the problems do
not appear and AZGCORR  works correctly (attached jpeg1), but when the
image is first converted to .bsq and atmospherically corrected the
image seems to be corrected up until the point of the missing scan
lines, but after that appears to be just 'stretched' to fit the
correct outline (jpeg2). The same problem is also being encountered by
John Dowens in correcting strips from GB06/07.

Do you have any ideas what may be causing this problem? Any
suggestions very much appreciated.  I was also wondering if you know
when I might be likely to receive the remaining LIDAR data from this
acquisition (I have the lidar from my Glasfynydd site but not from
Clocaenog)?

Just a tracker ticket for an issue found in #2. azgcorr wasn't handling the SCbedit vector correctly when BSEQ/BIL files were used.

Reported to Bill 18/May and fixed over the weekend in release 106. Some notes from Bill's email:

Updated azgcorr.481 by separate email.

SCbedit now works as advertised with the limitation that it only works for the first 16 bands of a data set (because it uses an unsigned int). It was originally only put in for the ATM anyway.

The "distortion" was because I had forgotten for BIL/BSEQ input to move the file when a line was skipped, so after each skipped line the image would shuffle up.

So now for CASI and Specim data the only option is the whole frame is skipped if it is flagged. This makes sense because with a CCD sensor it would be pretty unlikely to have a whole row dead, columns maybe but not rows.

The default in azgcorr.48* is if there is NO -be  the SCbedit vector is used;  if there is a -be then SCbedit is not used and no lines/scans are ignored. 

This needs testing