Difference between Azspec and Caligeo processed Hawk data

[benj]

Split off from ticket #113.

Hawk data processed with Azspec and Caligeo shows a gap between the two, particularly at the short-wave end of the spectrum. Over land the two are very close at the longer-wave end, over water Caligeo is consistently higher than Azspec (though the gap is larger at the short-wave end). Azspec data looks more plausible but Hawk needs calibrating to check which (if either) is correct.

[benj]

Azspec and Caligeo processed data over water

[benj]

Azspec and caligeo processed data over land