One of the features of a FTS is that it readily supports an imaging mode, which, in turn, improves collection efficiency compared with those of the more traditional spatially scanning systems. TES employ 1 X 16 linear arrays, each of whose individual field of view is 0.75 X 7.5 mrad (see plot below). At the trailing limb, some 3100 km distant, these values translate to spatial resolutions of 2.3 km vertically and 23 km horizontally. Inasmuch as the same arrays are used in nadir (705-km range), the projections become 0.5 km in track and 5 km cross track at the Earth's surface.

(click to enlarge)