SENTINEL-5 is operating in nadir looking push broom mode from sun synchronous low earth orbit. The wide across-track field-of-view (FoV) of 108° provides a wide swath of about 2670km on earth and thus almost globally allows for daily coverage of the earth surface, as illustrated in Figure 3.
Figure 3: SENTINEL-5 observation geometry and coverage requirements (credit: ESA).
Legend to Figure 3: Upper left: representation of the 2670 km swath width of SENTINEL-5 which translates at instrument level into a large across-track FoV of 108.4°. Upper right: Swaths of two consecutive orbits, indicating small gaps at the equator. Lower: Resulting revisit frequency map, showing the daily coverage within less than one day for latitudes > 14° and <– 14° latitude.