The National Gravity Survey of Botswana, 1972 - 1973, by C. V. Reeves and D. G. Hutchins (1976)

In 1972 and 1973 field work was carried out to establish the first nation-wide gravity survey coverage of Botswana. The gravity determinations were controlled by a new network of gravity reference points connected by a new network of gravity reference points connected to IGSN71 datum points in neighbouring countries. Heighting of stations was achieved by altimetry controlled by trigonometrical heights and the new precise levelling network in Botswana. Station positions were determined with reference to accurate survey points using vehicle mounted navigation equipment. Access to the most-remote areas was achieved by helicopter, using satellite imagery and photographic print laydowns as navigation aids.