Abstract
Abstract 1. The use of helicopters for geodetic and topograpical surveys is now receiving greater prominence. In the past helicopters have been employed mainly for positioning ground survey parties, and on occasions for long range barometric surveys and spot photography. The United States Geological Organization has evolved a technique for use of the helicopter as an elevated station to which distances, and horizontal and vertical angles are measured. These observations are reduced to ground level to determine the co-ordinates of ground zero immediately beneath the helicopter. The Australian concept is very similar except that to widen the parameters for operation of this system in Australia and Papua-New Guinea, the optical ‘hoversight’ used to maintain stability of the helicopter above ground zero, is rejected in favour of television componentry which, on preliminary investigation, is considered to provide greater hovering potential. This paper describes briefly the history, current and future developme...
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