The reliability and conservation value of ranger-collected data on elephant poaching by Kuiper, T

“…However, ranger patrols are biased in space and time and detections are imperfect, so what rangers observe may not capture underlying reality well. …”

Spacecraft Missions and Programs to Moon / by Payne, Zenobia, author 648349

“…The Ranger program was a series of unmanned space missions by the United States in the 1960s whose objective was to obtain the first close-up images of the surface of the Moon, The Ranger spacecraft were designed to impact the lunar surface, returning imagery until they they were destroyed upon impact. …”
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Snow Depth Measurements by GNSS-IR at an Automatic Weather Station, NUK-K by Trine S. Dahl-Jensen, Michele Citterio, Jakob Jakobsen, Andreas P. Ahlstrøm, Kristine M. Larson, Shfaqat A. Khan

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