Likely answer edit

IKONOS data products — six levels of correction.

Level What’s corrected
Geo Basic geolocation using sensor ephemeris
Standard Ortho Orthorectified using a coarse DEM
Reference Tighter orthorectification, GCPs
Pro Professional-grade orthorectification
Precision High-accuracy GCPs + detailed DEM
PrecisionPlus Highest accuracy product in the catalog
  • Pricing model: purchased by square kilometer — you pay only for the exact area of interest, not for a fixed scene footprint.
  • Imagery coverage was global but tasked on-demand (not a continuous archive like Landsat).