Likely answer edit

IKONOS off-nadir pointing.

  • Can tilt up to ±45° from vertical in both along-track and across-track directions — much more aggressive than SPOT’s ±27°.
  • Enables:
    • Frequent revisit of any given area (~1–3 days at mid-latitudes).
    • Stereo imagery — both side-by-side (across-track) and fore-and-aft (along-track).
  • Example: the “1 m IKONOS pan image of Rome” from spaceimaging.com.