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Ticket Resolution Summary Owner Reporter
#105 invalid Hawk FODIS seems uncalibrated benj benj
Description

Inspection of the FODIS output for Hawk (level 1b) suggests that it is uncalibrated (or otherwise incorrect). Spectrum generated (taken from Nigg Bay line 3) is:

(X-axis is band number for Hawk, not wavelength). Graph shape should match solar spectrum (see eg http://fsf.nerc.ac.uk/img/g37_grph.gif) and doesn't.

#106 invalid Hawk data very noisy in some bands benj benj
Description

Some Hawk bands are noisy to the point of uselessness. For example band 71 (1403nm), raw data from Nigg Bay line 3 (attached)

Also see over-water spectrum produced in level 3 image:

Hawk 8-pixel average spectrum over water in Nigg Bay

Spectrum cannot really be used for anything much - there is no means of quality controlling the data

Data issue occurs over more than one flight, possibly there are sensor problems with some Hawk bands. See eg. Latera band 71, similar to Nigg Bay:

Hawk band 71 (line 1) raw data from Latera

#107 invalid Eagle/Hawk spectrums misaligned benj benj
Description

If you plot Eagle and Hawk processed output on the same graph (see attachment) there's about a 30nm overlap for the spectral range, and the instruments don't seem to agree in this overlap. Even if the instruments don't give the same magnitude, the absorption features shown should align (and they don't). This suggests that the spectral calibration of one or both instruments may be out by up to 100nm, which appears to be the displacement needed to make the two graphs align.

Eagle/Hawk spectra from level 1 data (Nigg Bay line 3). Top lines are over land, bottom over water (with possible sun glint).

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