The average instantaneous field-of-view (IFOV) of 1.4 milliradians yields a LAC/HRPT ground resolution of approximately 1.1 km at the satellite nadir from the nominal orbit altitude of 833 km. The GAC data are derived from an on board sample averaging of the full resolution AVHRR data yielding 1.1-km by 4.4-km resolution at nadir.