All five missions were successful, and 99 percent of the Moon was mapped from photographs taken with a resolution of 60 meters or better.
The first three missions were dedicated to imaging 20 potential manned lunar landing sites, selected based on Earth-based observations.
These were flown at low inclination orbits. The fourth and fifth missions were devoted to broader scientific objectives and were flown in high-altitude polar orbits.
Lunar Orbiter 4 photographed the entire nearside and 9 percent% of the far side, and Lunar Orbiter 5 completed the far side coverage and acquired medium (20 m) and high (2 m) resolution images of 36 pre-selected areas.
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